So instead of wanting to you know become the title this whole 1000+ chapter manga is about, BB instead wants to be a king of a nation no different than any other mid tier Pirate we have seen: Croc, Doffy, Kuma, etc. So BB stopped being a Warlord which would have given him that authority of "king of a nation" so that he can become a Yonko who needs approval from the WG in recognizing his territories. One Piece is basically just a bunch of random subplots that make no sense.