I would refer to Rhyheim Shabazz's site and see how a professional does it. Actually he is not someone I would be all that attracted to but he does a lot that makes his site worthy buying into. First, it is filmed well. I think it may be because he has someone else doing the filming so that he gets good shots. However in the beginning that was not necessarily the case, meaning that he had stationary cameras. However that being the case he still was able to film and edit his vids in such a way that the sound was very good and you could see the good shots (in most cases). Second, as was mentioned, in general he has been able to film with guys that are very appealing. Of course, that depends on your taste but as time as gone on he has been able to get the bigger stars to be his partners (not size but stardom). And he treats his partners in a really appealing way. Some he knows to be very passionate and that proves what certain audience members want. At other times he can sense that his partners just want him to be a little rougher and that appeals to his audience. Of course, people want to film with him because they figure his audience might see them and join their sites. As also was mentioned, he puts out a lot of product and much (if not most) is done with other guys. On some sites what you get most are solos but I do not think most audience members just want to see a guy jack off every day. Some are but it seems that most are paying to see the person you are paying to see have sex with other guys. A solo very occasionally is OK. Also, as was discussed, put the link to your page everywhere so people who see you know they can get there and know what your moniker (?) on the OnlyFans page is. Unfortunately, it appears that Rhyheim recently has had more and more guys doing scenes where he does not appear. The two guys are worth watching but I fear he is just going to be producing more and appearing less. I am not sure if people will remain as patrons.
P.S. Forgot, one thing I initially found helpful was to have short trailers of what you expect to show in the near future on your OnlyFans site on your twitter page. People (I believe) see what they will find and get interested.