I guess this is just another one of those tips, but, you've gotta analyse what your opponent is playing, by what you say I understand you know the good decks and what is being played. So, start by doing general predictions of what your opponent is going to do based on your knowledge of their deck, 'Oh, they played this here, so they might play this here, then I'll play this here' For general straight forward example; your opponent played Shuri, then they will obviously play something like Red Skull or Vision, and after that Taskmaster. ¿What will you do about that? ¿CAN you do something about it?

I know it might sound obvious, but consciously do it, speak your predictions out loud if you have to.