Striker is obvious and if that's the only position we strengthen then fine. If I were being picky then another winger with pace would be nice. Roerslev is nowhere and Bree can't play every game as the season goes on so perhaps improvement at RB too. A better CB would be the icing on the cake.
We're looking at promotion, we need to have one eye on that to improve the team/squad for when we get there, and if we don't then, heck, we are stronger next season even though we could potentialy lose Jander, Fin and Leo over the summer if bids come in.