You may want to run ad promo campaigns on titty lover IG accounts such as:
https://www.instagram.com/cer_de_liis__2.0/
Your content tends to be for a more mature audience so understand it will take a bit more digging to find your clientele BUT also you're going to have to learn some new tricks to KEEP them. So the above comments suggesting you become more 'interactive & engaged' is spot on. I'd say give each girl a different theme so each develops her own fan following if you wish to remain anonymous.