When the coach decides your fighter can’t move up in weight anymore is that it?

Hi, I just wanted to figure out with the weight change when your fighter moves up in weight and then your coach says, he will struggle to compete at a higher weight level is this permanent?. Or can you fight a lot of fights until tnis option can change. Because my fighter is kinda struggling to find fights as a unified champion and I want to know if I can move up instead of down.

Appreciate if you could tell me if I can or not Thanks.