The search feature on OF isn’t the best, but there are a few accounts dedicated to feet and or tickling. I’ve found a couple through the forums here just by searching “only fans.”
Another downside is that for the most part there are no previews of content so you’re forced to either subscribe to that user (could be free) or not be able to view their content.
I usually give a little money in the form of "tips" to get onlyfans models to do tickle stuff, or whatever else I want to see them do. If it's a foot model they most likely will honor your request.
I post videos on PH and occasionally I'll promo on here, although I mostly just come here for the community. I honestly couldn't tell you where most of my only fans traffic comes from, but probably PH.