The tarantula trick still works if you get a bamboo island after 7. There's no rivers or ponds to spawn the water beetles, so it's the best chance to make big money if you're lucky enough to get a bamboo island
Also a heads up, there are items you can get if you link your game to the mobile game, Animal Crossing Pocket Camp. I did it mainly for the campsite sign, but I've also ended up using the hat more than any other one I've found in the game. This link explains how to do it. If you haven't played Pocket Camp I'm pretty sure you just need to install it and play the tutorial
https://www.polygon.com/animal-cross...ossover-unlock