Looking for tips on how to strengthen team

[John Bee-line]

Hello all!
Looking for tips on how you determine where to strengthen your team in the draft and/or free agency. Do you go simply by overall of current starters (replacing low ovr with higher)? Simply fill in where you are lacking starters and/or depth? Or do you have a more nuanced approach? For example, is there a way to find weaknesses in your roster, maybe players that don’t fit your game plan instead of just looking at ovr?
Appreciate any tips!