So…
Why is Boba doing this stuff? Why did he go back to Tatooine, kill Bib and declare himself Daimyo?
I feel that what the show (particularly last week’s ‘tree vision’ sequence) is trying to convey, is that Boba has felt trapped in the identity of a bounty hunter - which he just borrowed from Jango - for a while, and feels the need to reinvent himself. When ensnared in the tree branches he has flashbacks to his past, and only breaks free of said past by breaking the branch which is what forms his new gaffi stick: a crucial part of his new identity.
It doesn’t take much Wikipedia to confirm that, in feudal Japan, daimyo served under shogun. If that applies here, who was Jabba’s shogun???
Yeah, but the term Daimyo is pretty loosely applied to this context anyway. It likely doesn’t have the same specifics it did in feudal times and is used just for cool factor (which I don’t mind at all)