You can try acoustic panels inside. Double-pane windows and heavy fabric or drapery can help prevent it from traveling outside. If you have the birds outside, acoustic panels, bamboo fencing, and vegetation along the cage can break up the sound. One thing to keep in mind is that noise is subjective. What bothers one neighbor might not bother another. Your best bet is to talk to your neighbors immediately and ask if it bothers them, then work together to mitigate the noise if it's an issue for them. We had a neighbor who was an absolute nightmare over our green wing macaws. We realized it wasn't just our birds; we were just her current target. There was a long history of bullying people over noise, and she expected absolute silence in the neighborhood. After deciding to enclose our patio and make a space for the birds, she messaged me every day, asking when it was going to be done. The fact that we needed permits, inspections, the actual construction, and inspections along the way wasn't good enough. It didn't matter that this was all during covid, she wanted it done immediately. She even filed noise complaints with the city, which they closed because they never heard the noise. None of the other neighbors had an issue with it; the macaws only made noise at sunrise and sunset. During the day, they were mostly quiet unless something disturbed them. It only took one person to make it a problem because she had an issue with the noise. It wasn't misophonia; she was just a sour person. Do what you can, and expect someone to have a problem, but work with them, and hopefully, you can meet in the middle. Maybe you'll get lucky and move next to a crazy bird person and it won't be an issue at all.
