Realistically, how much better could Biden/Trump have done

[Non Swing Voter]

Really seems like the only states that were ever in play were: PA, MI, WI, AZ, GA, NV, NC.

And I really think MI is a stretch to even include in that list because it was too much of a margin to flip and people were too settled on their decisions. 

I think WI, AZ, GA, NV were truly flippable because the margin and raw vote differences were fairly low.  PA was going to be hard though doable for Trump.  NC the same for Biden.