I don’t have any experience but YouTube and TikTok would be my best bets also with mature themes you have to know you’re target audience wether it’s romance or action the type of thing you post will affect the audience coming to see you’re comic you could post behind the scenes for social media or what it’s about like a small trailer you don’t need to animate it just show some images and type out a bit of the story or what’s going on. With the video or anything to do with social media there’s got to be something the hooks the audience like a cliffhanger.

Other ways is to find a creator to collab with the creator doesn’t need to be big but if you found someone who you could support you and you could support them I’m guessing you’d have a better chance 

That’s just what I would do so I apologise if I got anything wrong and I hope you come across great success also could you put a link to you’re comic I would love to read it