Disclaimer: I’ve never had a mastodon account.
-
Authentication: who will have accounts? Artists and fans? How can you reduce spam accounts signing up? If you just have open sign-ups and trolls abuse it to mass spam other instances, they might defederate (Lemmy had this issue with a political troll).
-
Always go through all the settings/configuration!
-
if it’s within your means, decorate and personalize the place a little to match your purpose. I dont know how easy it is to do theming adjustments, even simole things like colour scheme. Especially since half the Mastodon sites all look the same.
-
Have something of value. Why should people use your site instead of just twitter and facebook? What can you do that they don’t? Does your audience care about those things? I can talk about FOSS and privacy and security for days but most people don’t care about that enough to join a different site.
-