Unfortunately, you can only get more kinds of fruit if you have Switch online. If you do, I could drop off some fruit tonight if you’d like. I can also drop of some veggies as well which you can bury to grow some of your own. Otherwise, you have to go to Harv’s island and unlock Leif in the trailer park area to the right of Harv’s photopia house. He only has I think one kind of crop at a time and it resets every monday.