I believe he needs to fight more boxers and even a rematch with Tete and beat him. That maybe put Casimero to the ranking again.
Did you mean Zolani Tete? Casimero won via TKO against him on 2019, I don't think there's much hype of boxing fans want a rematch between Casimero vs Tete. Casimero need to challenge a champion if he want to gain his popularity, right now either Casimero and Akaho are still unknown boxer out there.
I agree, a KO is a good win, or a dominating performance that will give him a mile score in UD if the fight lasted till the final round.
I doubt he can win via KO, his previous match against Guillermo Rigondeaux is really close, although he still win via split decision.