What you are looking for is how to soundproof a room, not treat it. There is tons of information on Google and YouTube for you to see what is in your budget.
Room treatment ideas for annoying external noises
big challenge is dealing with noises that come from outside the room.
Noisy landscapers from your neighbors, a dog barking, and inside from the refrigerator compressor buzzing all the time.
Anyone try to deal with these noises and how best to do it?? Thanks