Join the five communities your ICP lives in

Read the rules page of each first: traffic is not permission. The big ones route every product mention to one weekly thread and remove the rest, so check where promotion is allowed before you pick the five. Then rank by activity, not size — comments per thousand members on last month’s top posts. A five-million-member hobby sub can be quieter than a niche one, and a big group can be one admin posting to nobody.