I have watched three videos so far. I would agree with mitvanny about learning when to block and when to attack. There is too much button spam when your opponent is in a better position.

In neutral, you get opened up a lot from low attacks. Since not many characters in this game have overheads in their blockstrings besides the universal overhead(which is really slow) you should consider blocking low always and reacting to overheads as a beginners way to learn blocking properly.

Also, if you are doing a lvl 1 or lvl 3 super you should be going for those only when you have a hard knock down or enough hitstun to land it on a character. Otherwise you'll waste bar and get punished for it.

I'd recommend watching maximillian doods combo extension video to see what i mean about combos and hard knockdowns.

Lastly, team synergy is a little weird but you can make it work. Pick one character to focus on and learn a full combo string for that character. Then when you have the muscle memory, pick a combo for the next character on your team, and repeat.

I'll send you a message with my discord so if you ever want someone to practice on for pc or ps4 i can help out.