Knock between 6 and 8 pm when they're calm. Say, Hi, I wake at 6 and the walls are thin, could you keep music low after 10 on weeknights, and here's my number if a text works better. If it keeps happening, use a fan or white noise, slide a loaded bookshelf on that wall, log dates for a week, then email the landlord with the log.
Treat this like uptime. Schedule two recurring touchpoints a week and do not cancel. Pick things with a roster so you see repeats, like a rec league, a weekly class, or a volunteer shift. Open with 'Hey, I'm new, what's the move here?' then after the second meeting say 'I'll be back next week, want to swap numbers?' Track names in your phone right after. Safety is the usual triage. Public places, daylight first, and bail at the first weird flag.
