As a fisher i enjoyed every moment from lvl 1 to 60 mainly because i like fishing irl as well so i had +1 reason to start with it.
Regarding ideas to improve it, i've been thinking the possibility that we could fish inside dungeons for example in sastasha for 1-2-3 special fish living there and also if we could fish as a group with a (crafted) boat or single boat. Fishing away from the shore in general. Weather-wise besides the normal conditions (storm-clear etc) i would like to see the intoduction of full moon weather where we could literally fish under a decent moonlight.