rofl. Eh, there's a few things I'd advise you to fix:
A) Fight a D3 that shields more. You'll learn that some of the stuff you do is unsafe, and D1's Falco spot dodging habit is allowing you to get away with these things.
B) After an auto-cancelled Uair at low percents, you can connect it to ANYTHING (except Shieldbreaker, and counter, also, Dair and dsmash are situational and unadvised.) Please, use an aerial. You can follow these up very well. Nair is good for starters.
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You're aggression is very good. It reminds me of why I modelled my Marth after yours. Glad to see you keep your blade sharp. I picked up a few things: Bthrow sends your opponent low, making it easier to edgeguard, Two dancing blade hits while going off the edge to score slight ping damage, and increase the chance of them getting hit by your Dolphin Slash recovery (because it deals 7 damage to opponents near the ledge, even if you sweetspot the ledge).
I also approve of your lack of fishing for a grab. Grabs are not really an effective part of Marth's moveset unless used for a specific purpose.
OH! Almost forgot. You often Usmash recovering D3. Just keep swatting them off the ledge. After they use all their jumps, they have to rely on their predictable UpB. Mix up Fair, Nair, NON-Tippered Dair, and Bair to keep hitting them off without letting them land, and rack up amazing amounts of damage.