Shake all the fruit off of trees and sell it back to Tom Nook. All the fruit in your town will probably be worth about 20,000 Bells. Fruit grows back every 3 days or so.

Also, catch fish and bugs. ^_^

get a diffferent fruit from a freinds town, plant the fruit and then sell each fruit for about 500

Also, dig up fossils every day by looking for brown, "X" shaped cracks in the ground. You should get 2 to 5 fossils every day, and depending on the piece, each can be 1,000 to 6,000 bells.

Don't but anything 4 ages. Wait till u get 999. Then, buy two shovels. Bury 1 of them. On the next day dig it back up. It will now be a golden shovel. Put all of your money into a bag. Plant it with the golden shovel and water it LOADS ( not too much) in a few days a money tree will grow. Every day you will get as much money as u planted. To get all that money, do loads of fishing and sell all your fish. The best fish to sell is Coelacanth, which u can catch mornings, evenings and nights in the sea when it rains. It is extremely rare, though.

you are a greedy little brat! do you know that???