Seeking advice for customer acquisition

Edit: thank you everyone who took the time to comment! Hello! I have a health and wellness app that helps people track their compliance on therapeutic diets with the help of AI. I’ve gotten very strong encouragement from friends in the tech industry but am finding acquiring customers difficult. I don’t spam my app in communities on Facebook or Reddit, but I’ll briefly mention it here and there when someone else posts or comments about using apps to help with therapeutic diets. My user growth is about 2-3 per week. If I try to ask communities to talk w people for user research, I’m finding most communities will delete the post, even if I am not selling the app but want to talk with others about their pain points. I’m curious, what customer acquisition strategies and techniques have worked for you?