When you get to the point where you have to build and furnish 3 plots, you can use a reset trick to get villagers you want (or just avoid hated ones) if you couldn’t find em on islands.
Basically, make all the outdoor furniture for every house and make sure it’s close enough so that it counts and is checked off on the list, but don’t submit all the indoor furniture to the box - leave at least one of the required items outside each house.
Wait for the autosave (the saving symbol when loading into the game doesn’t count).
Now quickly submit the last item, run over to Nook and tell him. He’ll let you know that you can look at the plaque to find out who is moving in. Run back to the plot. Check the name. If you don’t like it, reset the game. If you do like it, wait for the autosave and move on to do the same with the next plot.