There should really be room to add someone making 15M and someone else making 12M, plus Perez again at 5M. Spotrac currently has the commitments for next year at 27M, but that only accounts for the guaranteed money, and they technically haven't included a huge amount of players. That huge amount of players will basically all be pre-arb, league minimum, other than Keller, Brubaker, and maybe 1 or 2 others who will get modest raises in arbitration.
But in a brutal sense, I think regardless of how reasonable it might seem to sketch anything out, the only attitude to take is "I'll believe it when I see it." A couple players making 7 figures would be minor additions for 20+ other teams, but signing Quintana, Mancini/Drury/Haniger, and Perez would be unprecedented from Nutting. I don't have my hopes up, but the talk has always been that they'll spend when it's time to spend, and Cherington at least seems to want us to think that he's embarrassed about 2022 and that improvement is "urgent".