That X+B move on the Xbox controller (sorry idk the exact numbers of the limbs) is crazy when you can time it right and when you put it into combos where you’re juggling the opponent is even more crazy
Go to your replays where you lost, and control your characters on moments where you made a mistake. And repeat that moment for like 20 minutes. Do that for like 5 distinct moments, for like an hour and a half practice. Best way to get better. Also, there's ghost battles, but the replay option isolates your training regimen to specific things
Do not practice against the cpu it reads inputs and is quite lax on punishing and combos, you'll actively ruin your gameplay doing it. If you want to do some offline stuff practice against downloaded ghosts instead since they at least pick up actual habits players have instead. The replay feature, especially in matches you felt were too overwhelming, also helps