Tuen vs Tommy (Falco)
A good start is doing a dropthrough+Z(instantcatch) on battlefield, that way you have an armor piece and you just dropped through the platform.
Overall you should work on your followup game, stuff like dtilt>utilt doesn't really work.
At 0:16 you also throw out a random fair, which isn't something you can really do, because you'll get punished for random moves. This ain't Marth, this ain't MetaKnight. We have to space our moves, because they're probably punishable if they don't hit/scare the opponent. If you throw out random moves, at least full hop them. Our short hop is trash.
Also, don't backroll. Just, really try to never backroll.
You can downB jump off of items like your own armor pieces, use that when recovering.
Shielddrop > utilt is a viable punish. Don't be scared of your shielddrop lag, because it's way overrated.
Really, shielddrop lag is overrated, you always spotdodge to get out of shield.
If someone is above you, that's the time to strike. If you think jumpuair is obvious, why not go for an upB, or upSmash. Talking about 0:50 here.
Be more confident in your followups, learn your hitconfirms. If utilt is blocked, have a mixup game ready to try to avoid the punish. Overall use less utilt, it's -44 on shield lol
Be less one dimensional in your juggles. If you uair someone TWICE with the same method, its quite obvious theyre gonna mixup, and the thing with ZSS's vertical acceleration is that if you miss a rising uair, you're in a baaaaaaaad position. Overall its way better to do falling uairs or stuff like upb. We ain't mk, we can punish airdodges but not with spamming uairs.
Overall, work on your followup game and spacing. 99% of the time you don't capitalize on a good hit. A falling uair sourspot should be a free utilt or reverse dtilt. You can even dash past them, wait for the spotdodge, and pivot grab or something.
You jab a lot, which isn't a bad thing per se, but hitting a jab is 1% damage+reset, hitting a dtilt is >1% and a very good situation. Same for utilt, but less much of a good situation.
A game with ZSS against someone who isn't that good and doesn't know the matchup is oftentimes a combo video on it's own, lol. They don't know how well we can string and we have immense range to keep our pressure going. Offstage sideB's for kills at 70%, upBs NEVER get airdodged if they dont know about it. (hint: Its really good)
Tuen vs jedinoah MK 1
Learn to glide toss.
Dont backroll.
Overall, dsmash is really good for up close pressure, but it's weird to throw out because it has a ****ton of startup, that's why, like I told you, you need to read when people shield. After a dsmash on shield, youre pretty much advantaged, especially in a crossup.
I think this will do for now, telling you much more is useless until you have stuff like this in your system. You don't really know the character yet, which is hard, so I don't blame you.