Ok this goes in the falcon video critique thread but
First match: As a whole you're challenging Fox in the air at spots where Falcon is going to lose every time, every time you jumped to attack you were too close. This is just basic spacing for falcon, you have to pick where you attack from to make up for your quickest aerials coming out in like 7-10ish frames opposed to Fox's 3 frames for nair. Knee is 14 and stomp is 16, so you have to make up even more for them at neutral game just to trade, usually this is done from far away, by overshooting, or fade back knee/stomp if you think he is gonna move in. Overshooting with nair/knee/stomp is amazing and you should work to set up spacing positions where you can abuse it.
Second match: You're going for, and getting a lot of hits at neutral game, which doesn't really work that well against better players. Falcon is better when baiting>punishing. You were also attacking from a little too close here but idk sometimes marth just wasn't swinging his sword and you and let you hit him. You got a lot of side-Bs from far away that only landed because the marth kept getting mindgame'd the start up animation.
Third match: Marth is punishing you more for the random side-B', you lost some stocks cause of it. You were spacing better here, not super amazing spacing, but better than the other matches. looks like you're more comfortable on FD than battlefield.
extra general important tips:
-looks like you missed some L-cancels, it happens but try to be more consistent with them.
-you dash-grab. dash-grab sucks. Learn to JC grab, that's Jump Cancel Grab. Every time you do a running grab press X/Y/Up to jump while running, and during Falcon's 7 frame jump animation press Z, which causes you to do a sliding standing grab. Standing grab come outs faster, and goes farther, than dash-grab. The only time to dash grab with Falcon is if you're intentionally trying to get the dash-grab hitbox that goes behind him, or to grab a crouching jigglypuff, because she won't get picked up by standing grab.
-you wavedash too much? maybe. seemed like you do it a lot just because, there wasn't a lot of reason behind most of them, just be aware of that. You did a few to get marth to whiff some stuff so cool. And I saw you WD out of shield, that's good, WD OoS is pretty boss.