fandomcalendar which is good for tracking upcoming fandom projects/events
covidcoffeecorner is a new daily community with chatting prompts every day for chatting during this current lockdown time
sunshine_challenge should pick up in June will regular fandom based posting prompts // a sort of sibling community to January's snowflake_challenge
fictional_fans is a regular prompt topic chat community about fandom as a whole

Maybe those will help? I've found a lot of people and great conversations through those communities alone.