The reports are coming in from all over the Fediverse. While pixelfed.social is understandably working to accommodate the huge influx if new users, other Pixelfed instances are operating just like normal.
Users report these Pixelfed servers are running just fine:
https://gram.social/
https://pixey.org/
https://pixelfed.au/
https://pixelfed.art/
https://pixelfed.de/
https://pixel.infosec.exchange/
Don't worry about being on the main insrance, all Pixelfed servers talk to each other.