I think you are perhaps confused. And the answers are a bit confusing too. And, of course, we don't know any characteristics of your problem. Finally, people often seem to be confused at the word "terminated" in the response. Terminated is a synonym here for "done", or perhaps "finished".
So what did GA tell you? It said that
Optimization terminated: average change in the fitness value less than options.TolFun.
It went as far as it could. It was unable to find a better solution. Of course, that does not mean a better solution does not exist. But it thinks it is happy with the result. As happy as a computer program can be, at least. You gave it a tolerance that tells it when it can stop looking, and that tolerance was satisfied. I would note that this is the termination criteria that goes along with an exitflag of 1. In the world of MATLAB optimization, that is the best possible exit flag.
Again, I often see people confused when they see the word "terminated". They think of that word in a negative sense, and it definitely can have fairly negative connotations, at least these days. Here, it just means "done".
