Why not just create the community on another instance?

This reaches the borders of my understanding of the fediverse :) You mean I could create it on Lemmy.ml for example? Would I need to create an account there? I’ll explore, thank you for the suggestion.

• Create an account on another instance (I suggest a smaller one, to spread the load)
• Create a community using that account
• Post or comment in that community with your main account
• Use the newly created account to promote your main account to moderator in the community
• Profit

A little convoluted, but I guess moving things off the big instances is good for the fediverse as a whole, because single instances only scale so far performance-wise. Don’t worry about discoverability. It’ll take a couple days, but it’ll work out fine. You can boost discoverability by searching for your community from bigger instances. That’ll kick of federation / synchronisation.

One question: with "main account’ on step 3 you mean my account here at Lemmy.world?

I don’t quite know how to post in a community on another instance: it doesn’t appear if I search for communities here in Lemmy.world.

Yes, the account you mainly want to use. In order to find your newly created account from your current instance (lemmy.world), type the following in the search field:

[email protected]

It worked perfectly. I really don’t know how to thank you.