I'd sell off 4* that you don't think you'll ever use even if you got more of them. When I was in your situation, I was getting Red Hulks and She-Thors.... and I sold them off to make room for 3*'s. These days, 4*'s are a little bit more available than before so things have changed a bit, but there are some 4*s that I knew never fit into my style of play so I tossed em. The 3*'s will be your bread and butter as you play more so I'd put a bit more priority on them vs. 4* or even a 5* at this point.
I even made the decision to not accumulate or champion particular 2*'s to save roster slots. I have no Dakens or Wolverines at 2*. Early on, I'd keep guys who you're planning to use instead of hoarding for the long term. As you play more, you can expand your roster at that time.
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