Would not recommend Sync, last update was March 2024 and there’s issues with reporting DMs, cross-posting and more. Just scroll through the community to get a general vibe of the userbase: !syncforlemmy@lemmy.world.
I personally use Thunder now, and I have used Eternity too. Both support account switching.
There’s also a community that mirrors posts and comments from Reddit, so it looks like a lot is happening here while it’s actually all happening on Reddit.
https://50501.chat/c/Mirror