Im actually have an account I was working on. It took me less than a week to get 100 instagram followers to the foot page. I just copied a Spanish chick page w/o watermark and put it on a fresh account. I don't use it anymore, cause I'm working on other stuff.
But I spoke with someone who was make $15k/month and he said most of your money comes from repeat businesses. All he did was purchase E-whore packs online with tons of pics & vids of a certain chick then just sell them to dudes. Sure you may have to sweet talk them, but that's what he did, then he would push them to onlyfans. All of this was done on snap & instagram.
It looks pretty easy, you just gotta sit down and put everything together from advertising, sales funnels, customer retention.