Match 2:
Outplayed on your first stock. Second stock plagued by jump -> double jump -> FF-aerial spam (which never worked if you watch the videos). Don't do that. I used to do that habitually and even thought it worked, but honestly it doesn't. So stop your bad habit now or it will consume your game. Third stock... why the Falcon Punch? It had no hope and it resulted in you getting Fsmashed and almost killing yourself before you got your bearings back. Continuing about the part where you almost killed yourself, why did you Uair and Fair? Your opponent was more than halfway across the stage when both of those moves came out. The Uair was especially ridiculous because he was not only essentially the entire stage away from you, you were also more than two body heights above him. The Fair is a little more excuse-able because I can see how maybe you thought you were going to land on the stage instead of rubbing the edge. But still, Fsmash and Ftilt (the only two possible ground moves that you could've been attempting IF you thought you were going to be on the ground) would STILL not reach him and he could've easily rushed you and then Side B comboed you for 15% or however much it is.
Honestly if not for 3 or so edgehopped Sweet-Knees and a crazy SD by your opponent, you would've been two stocked with ease. Actually without the Knees and the SD you would've been borderline three stocked. Honestly I don't know what was going on that match, because your first match at least had some decent moments. This match was just a trainwreck.
I don't mean to sound harsh and I hope you don't interpret my criticisms as being personal attacks or anything, but I really was disappointed in the second video. That said, here is my advice:
Stop the aerial spamming. Like I said before it doesn't work with the method you're trying to use, and the more you do it the harder the habit will be to shake as you take steps to try and grow as a player. This is probably the weakest part of your match. First stock: 2 ground moves. Countless aerial spam. Quick death and low damage given. Second stock: About 10 grounded moves. Even though your accuracy was low, you at least did better in trying to work in some move variety. And you killed him during this stock! Third stock: Around 7 ground moves, and two of those were the first two jabs in the AAA combo. So really 6 probably. You lost your last stock because your opponent finally realized that you're going to ledgehop and aerial everytime so he just spaced and punished.
Don't Nair. Really I don't remember you even connecting with it once. Maybe you did. But honestly even if you DID hit with it, it didn't make any significant impact. You have much better options. Heck, even spamming the Knee and hoping you get lucky is a better option (and that's a bad option). In my opinion, Nair is only remotely useful as a combo breaker. That's it. I can see it as MAYBE a defensive recovery tactic (good reach and as you're falling it has a really tall window of connection) but even that's a huge stretch.
Falcon Kick more. Running A more. AAA combo more. These are three of your best tools as a Falcon player and they are probably your three least used moves. Running A -> Utilt -> Chase with Uair/Bair is a really nice string that works quite often. If they air dodge a lot wait for it and Bair them, otherwise chase and Uair. I know it's hard, but aerials really belong in aerial combat, not ground combat. Sure there is definitely room for some Bairs and even Dairs against standing foes, but this should not be the core method of your game.
Dsmash more. It's actually a pretty decent move if you use it right. AAA into Dsmash or even Fsmash can work at times. Also, grab more. I know it can be hard, especially against Marth, but it is a crucial part of Falcon's game. Every throw except Bthrow is useful imo depending on the situation, so experiment with each of them and try out various followups. There's really a LOT of options out there for you on the ground. And even with the priority issues that always seem to arise, your ground options are way better than aerial spamming.
I hope this helps, because that was my intent. I look forward to seeing more videos of you as you (hopefully) progress forward as a player.