I was wondering how you get worker lvl up like logging fishing combat ect. I have 25 workers that I’ve had for months now and only some have increased in those areas others not at all even ones w full lvl to promote ? I’ve sent all world gathering more than I can count and the gather stat does not have anything? Please help

Worker only gain level in world trade and only at the events between cities like fighting, cutting wood or gathering.
So you should send your strongest workers with highest level to world trade.
Since there's no fishing in world trade, workers won't gather level in fishing. I haven't found a way to lvl fishing yet.