[thesuperbigfrog]

Some partial substitutes depending on what subreddits you frequent:

https://programming.dev/

https://slrpnk.net/

https://tildes.net/

https://raddle.me/

https://scored.co/

https://lemmy.world/

https://lemmy.ml/

https://kbin.social/

https://squabbles.io/

https://saidit.net/

Reddit migration directory: https://redditmigration.com/