You won't be community banned for resigning and becoming staff on another server.
The post you made was just saying that you were playing on another TTT server and liked some of their features wasn't it? If so then I have no idea why it was removed because it wasn't advertising it. You was just suggesting we get some improvements and check other servers for inspiration like you did.

If you are going to resign everyone would understand because you want more players.

You won't be community banned for resigning and becoming staff on another server. The post you made was just saying that you were playing on another TTT server and liked some of their features wasn't it? If so then I have no idea why it was removed because it wasn't advertising it. You was just suggesting we get some improvements and check other servers for inspiration like you did. If you are going to resign everyone would understand because you want more players.