>>11264568>enforce the rule of Tits or GTFO>no reddit faggotry>little to no avatarfagging>keep edgelords under control>little to no porn dumps>active and lively community eager to act together>lulz>small mod intervention after all image boards should be relatively free speech oriented
>limited politics and no agendapostingthings like BBC and transgenderposting, but also pro/antitrumposting should be minimized, otherwise, your image board will be caught in this identity politics bullshit.
Balance this and you might keep the right level of quality and freedom in your community resembling an early chan that was just doing it's thing.
Also you should allow it to grow organically, your site hitting mainstream is bad, as the huge increase of newfags might cause an erasing of the culture your chan developed, being replaced by whatever reddit and twitter are discussing at the moment.