Charlo and Castano are fighting in May for what I think is undisputed. Tszyu is ranked WBO #1, IBF and WBC #3 (behind Charlo and Castano I'd assume) and #5 by ring. Theory wise, he can take on the winner or loser of the above. Its about the $$$'s though and I do not believe he's mandatory (but could be wrong).
I think he needs another US fight before he goes for either of these 2 guys. I'd be thinking the winner or loser of Lubin and Fundora. But again, timing and $$$'s.
Whomever he gets he needs to knock out. That gets everyone's attention. Good fight today but think the yanks view him is a bigger, less skilful Loma. That could be an issue for getting the fights.