Tatum HAS to recruit Bradley Beal this offseason. I think he's their best chance at getting a real 3rd star to pair with Jaylen and Tatum moving forward. Doubt KAT is available and even if he was, it'd definitely cost Jaylen and others in a package.
I think I read somewhere that the C's can keep Fournier at a reasonable rate due to Bird Rights, so in theory if you're able to keep Jaylen, Brown, Timelord and then add Beal + keep Fournier, you might really have something. Or if Timelord is in that package, then I'm sure they can find someone with the MLE or something to fill that role.
You'd also hope some members of the bench show flashes and continue improving (1 of Nesmith/Romeo - whoever isn't dealt, Jabari, etc.) but I think we're seeing in these playoffs that starpower does matter. As ugly as it looked our bench actually wasn't bad statistically compared to BKN's. Lakers lost AD for a bit and suddenly they look mediocre.
Stars win in this league. Time to get aggressive and make the move to add one. Having a solid bench is good but you can probably grab 1 or 2 "ring-chasing guys" once you add starpower. In today's NBA that's not difficult to do. I'm also hoping Jabari Parker with a full offseason and a little familiarity in the system can show good progress for next season. He could be underrated.