@rufustheduck if you’re happy with where you are and there’s not another server you’re looking at and going ‘I wish I was on that one’ then you probably don’t need to change.
The recommendations you’re getting to move are probably a mastodon culture thing, I’ll explain as much as I understand from just being around:
Likely people suggesting you move are referring to the mastodon.social being sort of infamous across mastodon. Mastodon.social keep their numbers up by leaving no-approval-needed signup open, so they are quite large - but their moderation is worse as a result. I want to clarify that their mods and admin are generally good, no shade on them because they do good work - but they have so many users and new joins that they cannot moderate as well as other servers (just by the numbers)
Usually servers are fairly strict about other servers they can connect with. If there’s a server with a lot of bots trying to scam or manipulate people, it usually gets blocked pretty quick. Mastodon.social is tolerated despite this, because of how many users they have (you wouldn’t want to cut off that many other users from your own users)
Is that a reason to move off the server? Not to me personally, but everybody is different. I think you should only move to another if you really want to be there instead (‘Moving to’ rather than ‘moving away from’)