Congrats on the unexpected promotion. You've done well to build a team that seem to fit well with the tactic you've set up with some really underrated players (Sinani is a player I really do rate in the Championship).
I'd be interested to know your pressing instructions. I don't play with a BWM because I don't like how they aggressively close down players to seek to win the ball back. Paired with a volante (again, not a role I use often, but I understand is another role that seeks space higher up the pitch a little like a box to box midfielder) I would be worried that your team tries to get forward a bit too much and leaves lots of room between midfield and defence?
Maybe change your BWM to an anchor? Maybe as well drop the AM to MC to have someone else sitting naturally a bit deeper?
Again, not knowing how much you got to spend over the summer, I think my priority would be the full backs, an anchor and a striker. Make sure you're getting in to the big clubs early and see if you can get some decent loanees in.
Good luck!