Zion would be the guy I'd look at most closely. Certainly would have issues about his health, but I think he has a higher ceiling than Tatum if it all works out.
As for other trades I'd look at these very hard
Ayton, Bridges for Tatum
Anunoby, Barnes for Tatum
Sabonis, Turner, 3 1st's for Tatum
Wiseman, Kuminga, Moody, Poole, filler for Tatum, Fernando
Avidja, Bryant, Kispert, Kuzma, 3 1st's for Tatum
LaMelo, Bridges, filler for Tatum