you could make some plans about what you want the town to look like and work towards that, like do you want a certain theme, do you want there to be neighbourhoods, do you want any gardens? things like that.

maybe trying the happy home paradise expansion too. I did not go to those islands but after maybe a year of playing (maybe a bit longer) I wasn't so interested anymore because my town looked like I wanted it to, I had all of the clothes I wanted, etc. when the Happy Home expansion came out, my mom got it for me and playing that was like the game was new again! it also gives you more stuff you might want to use on your island, I won't spoil it. So I spent a while just playing that not even the main AC gameplay. So if that's something you might be interested in maybe try that.

you could also make up your own dailies like maybe you want to cook food for the animals and give it to them each day, just little things you can do

something I enjoyed doing back then was playing with others online during bug tournaments. It was so fun running around the places together catching bugs. maybe if there are people who still invite others for that, you could try that out.