A Starfleet Medical series might be interesting. Or a prequel with Dr. McCoy practicing some frontier medicine?
We saw on TNG there are medical ships.
It’d certainly make for some interesting ideas in potential conflicts between the Prime Directive and medical ethics for those in Starfleet - and with whom they come into contact with.
Also be good to see a different side/focus of the Federation than what we have seen already…
(and maybe even find out what happened to Khan’s super blood - https://www.youtube.com/watch?v=dTc1i74p1_c 😉)