@ChloeCat It never hurts to have alts. A lot of servers are hosted by very generous, talented but individual developers. Anything can happen to them at any time and there isn't a team around the clock that can fix those issues, having multiple alts on multiple servers is a very good idea.
I also suggest reguarlly backing up your Fediverse data into a drive offline just incase the instance your on gets nuked off the face of the earth randomly (cough, cough hetzner)