It should be an exciting mercato (unless Pogba leaves) with one or two exciting signings.
We'll have a nice budget. Our commercial and domestic TV earnings and gate receipts should be increasing this season. Only CL $ is likely to decrease. On top of that, we have some leftover cash from this season's budget.
And naturally, we'd want to keep improving our team, that includes the starting XI.
Signings that can improve our starting XI: a WC CF (Cavani), a very good AM with WC potential, a WC B2B (right-footed and not injury-prone)
Backup signings: a dependable backup for Marchisio (Lemina/Tielemans/Mandragora?), Cuadrado (but not for 20m)
Cavani will be hard to sign. And an attempt can only be made if Real exercises their Morata clause (and Morata agrees to move there - more unlikely than likely) or if we sell Mandzukic.
A signing like Gundogan can act as both the AM and the RCM (would also be one of the backups for Marchisio).
(If Pogba is smart, he'll wait another year and move to Barca, the best team, when Iniesta will be 33. He also needs another year to complete his development and be more consistently dominating. But if Pogba leaves, we'll need to sign another WC CM of course and will have even more $. No way Dybala will leave after just one season, lol.)
Remaining funds should be invested with the future in mind as usual. On players like Berardi, Saponara, Tielemans, Coric (can't afford all of them obviously unless Pogba is sold), a future Buffon replacement, and more inexpensive ones from Serie B and abroad.
Something like this should be the goal (not all will be possible) for senior squad next season:
Sell: Mandzukic, Zaza, Hernanes
Sign: Cavani, Berardi, Tielemans, Gundogan, Cuadrado
That's 4 players out and 4 in. 3 out, 3 in if Tielemans isn't possible and Lemina proves to be good. 3 different formations possible with that squad with good cover for every starting position. Players like Cavani and Gundogan (or an exciting young AM instead) will take us a step closer to the Big 3.