You were way too sloppy vs marth. Your DI is also pretty bad. You need to play more carefully when ur at high percents, and DI kill moves better.
You should mix up the charge of your upsmashes, you went for the same uncharged usmash every time, which led him to simply jumping to avoid it. If you had simply charged it at the end you woulda won. Predictability=Nono. Look at he times you are doing well. The beginningish of his third stock for example. You are playing fast, unpredictably, and efficiantly, without too much risky stuff. You are forcing him into positions he doesnt want to be him, without letting him dictate the pace while you just foxtrot and ETS. You want to play like that a lot more. There are times for passive playing, but your reaction time isnt that good so i wouldnt do it as much as you did.
You brought it close because you are a good player who knows how to punish lots of options, so you were able to play stupidly some of the time and still bring it back with some nice reads. However, you would have won if you mixed up your usmash charges, and did not take so much unnecessary damage, especially against a character like marth that can actually kill yoshi off of easy reads. The DI needs work also haha, but thats just reaction time.
If you dont think you are a top 5 yoshi, that doesnt matter, because it is a tournament results ranking, not a skill ranking, because thats how people want to do it for some reason. You have good results, surprise or not. Just get better if you dont think you are good enough, so that you feel you deserve your spot.
You are a good player though, you are just sloppy a lot of the time. You have periods of great play.
Edit: I cried when the untippered fair killed you game 2. PLEASE IMPROVE DAT DI ITS SO IMPORTANT IT WINS SETS. Your egg usage was a little iffy, you are good with them but didnt adapt to him punishing your tosses as well as you couldve.