This blogpost may be a bit old but is very valid as it goes through the points that an admin has to keep an eye on, verify the proper work and maintain regarding a Mastodon instance

Whether you’re selecting the first typeface for a new project, pairing a secondary typeface after the primary selection has been made, updating a brand with something new that retains the feel of the original, or anything in between, this checklist can act as a universal guide.