I’m not familiar with these communities, but you can also cross post this to !fedigrow@lemm.ee. That community is good about discussing which community to post in, and maybe organize some collective effort to lock a few of them to redirect efforts to a particular one.

Once you decide on one, it might also help to do the following:

1. Post in the selected community
2. Crosspost to larger spaces like !pics@lemmy.world
3. Leave a comment in the crosspost linking back to the community

That way people can discover the community over time