I was a bit focused on it when I first got my hands on the game, but now I don't care for it. Two reasons: One, I just don't have the time nor will to do so, and two, even if I wanted to, my town is fully developed now so it is nearly impossible to run or for bugs to spawn.
im working on catching all the fish since i only have 5 left to catch and then after that i just have 6 more pieces of art before im completed finished and im super excited for it!
I'm done with fossils and fish, and totally willing to provide all the bugs but they have not been cooperating. I still haven't caught a scorpion or stick insect. One keeps biting me and the other I have never seen on a tree at all. The only other thing I could work on is art, and it's not as much fun to collect imo because you get it from that dealer who regularly visits (or a random villager offer to sell one to you) and you can't come across it yourself like a fossil, bug or fish.
I have all but a handful of the fossils, only a few fish/bugs (mostly beetles and sharks), I think one painting?, and all 4 exhibit rooms are just flower storage