First of all, you have to move because it's an inherent defect that the builder didn't do a good job of soundproofing the house when it was built. Secondly, you have to go to the furniture market and look for soundproofing materials, but then your home will be completely changed. Anyway, it's a pain in the ass, and third, go ahead and negotiate with your neighbors.
You this matter is indeed very troublesome.