What's a better way to get a lot of XP but level faster other than buying a bunch of borders 1 by 1?? I want to have a good amount of xp

Buying any item one by one is a good exp boost. But the only other way is to decorate homes. I decorate the house to get the discount and keep buying the coin home on sale. If you use the mobile app you can get free items to help with decorating. But there really isnt many better options.

You can gain xp by decorating homes, buying from the stores (i.e. furniture, clothes, hairs, etc.). You can also do maxing, although that won't provide a significant amount of xp. Mainly, just decorating and buying from the stores has seemed to work pretty quickly.