Few things that may help:
- Work on your reaction times. You tended to just stand around and assess the situation more than you should have, and that gave your opponent a chance to escape. Try to get a feel for your opponent's habits and predict what they're going to do, then react accordingly. You need to think fast and move fast, because a good opponent just needs the tiniest of openings to punish you. Make sure you stay ahead of them before they're too far ahead for you to catch up to.
- Think about every move you use. The first time you grabbed Wario, you stopped and then used b-throw, when d-throw / f-throw combos were possible; you didn't seem to think about what you were doing, you just did it on instinct and it wasn't of benefit to you. It just knocked Wario off-stage with minimal damage, and he then proceeded to return without so much as a scratch on him.
- On that note: practice edgeguarding. There is no reason why you should not have chased Wario after that b-throw, especially with Pit's great off-stage game. You let him come back for free. You did this a few other times too, you got them off-stage and then never followed up, even when the opportunity was right there. Never let your opponent come back for free unless you're baiting something exceptional out of them or you know you can't challenge them.
- Optimise your reactions and punish options. Think about what move is the best to use in any given situation and why, instead of just doing it on autopilot. There's a bit at 0:24 when you could have punished Wario's dash attack with a grab, but you hesitated and used dash attack instead
- Never, never, never, never just stand at the ledge and wait. Cover your opponent's getup options and think about what they will do next, but never stand there and wait for them to hit you first.
- Don't use airs into the ground. Pit's landing lag leaves him wide open.
- You didn't play off-stage well, you didn't try to fend Wario off or recovery safely. Never put yourself in a compromising position if there is a way to avoid it (in this case, there was: you could have used f-air to get him off of you and buy time to recover).
- Don't use side-b unless you're
SURE IT WILL CONNECT. This has to be stressed: it's a rookie mistake and you will be punished it it's blocked, dodged or whiffed. Even then, save it for percents when you know it will kill, since it will have very little effect even if it does connect and you're just staling an otherwise good kill option.
- Work on baiting. There's a few times when you just used empty shorthop d-air, and I don't think you really had a plan beyond that. Baiting only works if you know why you're doing it and how to react to the opponent's movements: in this case, you could have baited him into coming for you when the d-air finished, then used another d-air to punish him. Just think about what you're doing before you do it.
- You need to know how to shield effectively and consistently. Try using walking / running shield, as I explained to you before.
- Don't use arrows in neutral. They're too easy to block and punish, and the reward doesn't justify that kind of risk. Use them to pressure your opponent and condition them into reacting in a certain way (zoning them or baiting an airdodge, for example) or to pressure them off-stage, but never just for the sake of having a projectile in neutral. You have other, safer and stronger options that you can use in neutral instead.
- Roll more cleverly: don't just use it to move back, use it to dodge and reposition yourself if spotdodge or shield isn't a good option. Try using pivots instead, since you can use f-tilt or grab out of it (both are very good punish options).
- Don't use rapid jab at high percents. That was probably an input error on your part, but it's worth remembering: at high percents, the opponent is very likely to fall out of its hitboxes.
- Be patient! Don't rush in every time you think there's an opening, it's very easy for your opponent to adapt to that and bait you into making an unsafe move. Play the neutral more, wait for the opening to come to you; bait your opponent instead, force them into your space and then play the game at your own pace. This is a bit trickier with Wario, since he passively builds Waft over time and you don't want to stall the match too much, but it's good advice for most characters. Even a character like Wario is best fought with patience, since he will try to capitalise on openings and get steady damage in before he can get the kill. If your opponent can force you to play on their own terms, you're already at a disadvantage. You need to maintain a cool head and
THINK, THINK, THINK, THINK before you rush in for the kill.
Best advice I can give you right now is to work on your fundamentals. There's a lot that needs to be improved here, but you can and will get better if you really try your best: hit the lab and practice movement options and combos, then keep playing better players and remember to ask for feedback!