Thanks for the suggestions!
Could you please elaborate a bit more on 'promoting on Twitter'? I do use twitter but currently I'm just cross-posting what I posted on Pixiv. Any other tricks?
From what I understand being a follower of many erotic artists;
Use hashtags, even just two is fine because you don't want to look like you're just there to spam. If you're doing a parody a popular series, hashtag that character, or if you're doing a fetish, hashtag that fetish.
Interact with your audience as well. Those that follow and respond to your work are those who will stick with you. Just because you have patrons doesn't mean they're loyal. The loyal ones are those that enjoy your work that you enjoy creating.
Follow other artists and retweet the stuff you like. Leave comments as well. When other normal followers look at your profile and look at your art they will likewise retweet your stuff and this will help build you up.
On my normal twitter account which I just follow erotic artists, when an artist posts something I retweet it. I don't post any art I made but I somehow have a few hundred followers because they like the stuff I retweet alone which helps them find new art.
Also, don't cross post back your e-hentai pages. E-hentai, much like F95 hosts a lot of Patreon content so fellow artists will be less inclined to follow you back. It's totally fine if you stick to using it, because artists like Glassfish do as well, however you should only ever link back to Pixiv, imo.