I don't know what the Twins are going to do. They are in a weird spot where they were way more banged up than the White Sox so they could project to being healthier next year, they may or may not lose Correa, but if they lose him they have more money to spend. I do think they will look quite different next year, but as with this year a lot of how they do will come down to Buxton's health.
I think the Guardians are going to be notably better next year than this. They played what, 16 rookies for significant time this year? Those are guys who are commonly going to get better with experience. On top of that, they have the #3 system in the league per MLB.com with 5 top 100 prospects, 4 of whom are expected to arrive next year. That organization is currently loaded, and they have so much youth that it's reasonable to think they could add to their payroll.
On top of that - Detroit and KC may be 70 win teams rather than 60 win teams (Detroit had an entire 5 man rotation get hurt, that may not happen again), and the schedules are more balanced so the White Sox can't fatten up on as many wins against Detroit.
The White Sox will be a talented team, but with their old roster I'm not even sure they will be the most talented team on paper next year. I still think the Sox have to try their best to compete for another year given where their roster is, but even if they make good moves they could easily find themselves stuck in the wild card or worse.