They should have done a show about the best bounty hunter in the galaxy tracking down its most dangerous criminals. A no brainer IMO.
I see very little story in this concept, let alone a Star Wars story.
Granted, I wasn’t exactly thrilled by what we did end up with, but the core idea did at the very least follow the philosophy of the franchise. The real issue, IMO, was that Fett was always a background or side character, and giving him his own movie or TV show was always going to be difficult within the established SW framework.