my two #mastodontips are simple.
1. If you are multilingual, pick the language while posting! If not, set language for your account. This helps everyone as people could filter out content they cannot even read in their feeds. It only works if language is set properly.
2. Turn on automated post deletion if you like to keep a low profile (and/or you are mostly here for fun and not focused on creating content that has long term value like me). It save resources for your instance owners!