Tease emperor clones - drop midichlorians into the mix.
Tease Ahsoka - the badass Jedi who went toe to toe with Darth Maul and Vader now has trouble defeating regular woman with a spear?
Thrawn - why not just throw another name at the audience out of the blue?
It's seriously annoying because all the story beats and puzzle pieces are there to make it an interesting and coherent show, yet it seems like they're doing everything in their power to not make it so. I really don't know the reason for that. Why not expand the recurring cast a bit instead of doing those one-offs? If instead of teasing new names all the time more characters would be aiming at the same goal and realizing that would make them band together with Mando being the centerpiece that glues it all together we could have an amazing show with interactions between those characters. Nick, Cerano, Ahsoka and maybe the Mandalorian heiress as potential love interest would make for a cool crew I would be more than willing to tune to and follow their adventures. As it is the show is kinda pointless.