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Watch out for rule 5: no how to questions.
But, for your question, I search using the search function on my client, eternity. For many smaller communities, they’re not going to be active.
[email protected] is a better place to ask for help.
edit: there’s also [email protected] which might be better, since the one above is lemmy.world specific.
I also found [email protected], which seems specifically for general Lemmy help questions, but isn’t too active.
I use the search feature in Jerboa
There’s a community that showcases new communities https://lemmy.world/c/newcommunities
Go to the search page and tap where it says “community” to search for what you want