Hey dude, I like how serious you are about improving. First time doing in-depth analysis so take this with a grain of salt, but here's my two cents:
VS Attack Party (Game 1):
0:33 Don't know if that was a tech flub, but you seemed to hesitate about getting up when you were knocked down. When your opponent is that far away you should try to tech immediately which is safe because letting them close in on you makes it an unsafe tech-chase mix up game
0:37 You shot a laser to cover Fox's side-b but he DI'd pretty low so you might've been able to cover if you ran to the ledge and dash-canceled down-smash
0:41 Very questionable rising laser, my guess is that you were trying to full hop double laser or shine waveland onto platform? If he chose another option than jumping away your laser might've been punishable
0:45 You chose to side-b when he was on platform which I think is OK, but he might've been able to punish with Isai-drop bair
0:50 Shouldn't have cornered yourself to edge
0:53 Watch out for shield pokes, if you expect your opponent to hit you after you recover, try angling your shield downwards to avoid getting shield-poked
0:56 I feel like you can buffer moves, like roll, once you recover since you had time to shield
1:02 Yeah like you said, you went for the shield grab and got shined, when fox is pressuring your shield some mixups are to hold shield and respond to his followup, buffer roll, or spotdodge. Getting shined risks getting knocked down and edgeguarded, tech-chased, or losing position with slow getup
1:07 During this sequence I feel like you went into autopilot, lasering is pretty slow, laggy, and suboptimal when you have invincibility imo. Your nairs were kinda high and you were too antsy to shield, roll, and give up stage position
1:10 Overcomittal early nair that put you right near the edge, could've been really bad if Fox turned it around on you
1:13 The pressure you did on platform didn't really feel tight or safe, if Fox took advantage and got one shine on you while you were on platform it would've been risky for you
1:15 Telegraphed full hop dair which is punishable
1:17 You seem to get antsy and roll, and you said you had Brawl habits, but a better option you could've done to reposition after Fox's d-tilt is WD OoS
1:19 Again, you went into auto-pilot and naired when Fox was already above you
1:21 Lasered too close to his shield and didn't follow up with shine but early naired instead
1:22 You shielded and rolled away again after you got hit, you should practice reacting better whenever you get hit
1:24 Questionable full hop nair and then bair when he wasn't close to you
1:26 "Plain" nair approach, easily punishable with dash dance or wavedash grab
1:27 Shielding and lasering when he's not close
1:34 I feel like teching away made you lose a lot of stage position and put you right next to ledge
1:40 The dair wouldn't have covered if he teched
1:44 Shouldn't have wavedashed back when you had the advantage edgeguarding
1:45 Random approaching laser
2:59 The dair is too slow of a follow up for the b-throw
3:05 Should have shined OoS
3:11 You always seem to up-tilt right after you tech, and if they catch on that's punishable
3:21 Random f-smash
Thoughts:
OK so this is my first time doing in-depth analysis so I'll start with Game 1, some parts of the video are kinda laggy. I feel like you need to have more fluid tech skill, reaction time, spacing, and timing. There were a lot of moments where you did an aerial on Fox's shield but didn't follow up (e.g. shine didn't even come out). Like you said, you also didn't seem to be doing a lot of waveshines. You did your aerials too early and I noticed a couple tech flubs. You also need to work on your spacing. You had a bunch of questionably spaced aerials and lasers. These are some things you can grind and practice on CPUs, etc.
Now for the big things about your playstyle, I feel like you autopilot a lot. You did a lot of aerials and lasers when your opponent wasn't even there. Try to grind your tech skill until it gets pretty solid, and have good control over your character so that you can focus your eyes on your opponent's character. Play slower and more intentional. Most of your approaches were impatient and obvious, with the occasional laser WD back. Try to do more zoning with non-committal aerials and play the neutral game more. An analogy I like to use is: if you're playing basketball, you don't want to go for the 3-pointers right away and hope that you sink those. What you want to do is setup so that you have a good chance of making the ball go through the net. The other thing is you autopilot on defense. You always shield preemptively even when your opponent is far away and you roll away and give up stage position when you don't need to. You also hold shield when you land after recovering instead of buffering a roll, etc.
Go for more pokes instead of committing and giving up stage position. When they're on platforms, one thing you could do is short hop u-air below them to force them to shield or jump, then read their jump. And to follow up on OninO said, start to play the mix up game. Though I think OninO overemphasizes conditioning and grabbing (which are better for Marth and Fox because they get a lot more from grabs with less risk than Falco), Falco has the advantage where his moves are super strong and take up a lot of space. Falco's approaches can be really safe and they force your opponent to react in certain ways in which you can mix it up and punish their escape options. Some mixups I like are:
-Laser->grab
-Late nair->jab
-Laser->turnaround up-tilt (don't really recommend if you don't have the timing/spacing down)
-Short hop forward->early dair (don't fast fall)->fade back
-Position laser so laser hits their shield (or their character), land close, and shine
You can also autocancel bair to keep aggro players out and zone. One of Falco's strengths is that when you lock people in shield by getting a shine-confirm, you have the aggressive momentum to do whatever you want to follow up. Early aerials after shine aren't safe (they can still be a mixup), but there's a bunch of safe(ish) options to cover their escape options. Never try to break people's shields with shield pressure, try to pay attention to their escape options. You can do stuff like:
-Shine->Early fadeback nair
-Shine->Early fadeback dair
-Shine->grab
-Westballz pressure
-Multishine
-Shine->wavedash back on characters with slower grabs or people who roll in a lot
So all in all: more tech skill training, more concept of neutral game and less over-committal approaches, more attention on your opponent's character and less autopiloting, a more developed mixup and shield pressure game