I use https://t.me/E621WatchBot on telegram to get notifications of new uploads matching queries. (You can specify an artist’s tag as a query.)

0. Choose an instance where the rules don’t forbid the content you want to post. If you’re looking for exposure of your own art, you’ll particularly want to avoid choosing an instance that has onerous rules. (One example of such a rule might be that porn needs to be posted as “unlisted” or followers-only.)
1. Mark the media as sensitive. How you do this will depend on what interface/client you’re using.
2. Use the “content warning” feature. This is not a place for a full description. Instead, imagine it from from the perspective of someone who would not want to see it. What keywords or descriptors would be useful to allow them to know that they shouldn’t click to show it? (A useful minimum would be something to indicate that it’s illustrated or RL, that it’s furry or feral or whatever, the apparent sexes of the characters, and any extreme fetishes depicted.)

Have you considered creating something akin to doesthedogdie.com? (Not on that catch-all mess of a site, but a new single-topic thing.)

A key goal of such a site would be the hope that the existence of it might go viral (because the idea that someone would care to create such a weird thing has some novelty to it), with the hope that just maybe writers/storytellers that hear about it might in turn be prompted to think about doing something different or more interesting.

Boof