For promotion methods you missed link in the welcome message. Other than that you covered most of the ways for promoting on Reddit. But lately they ban subreddits even with link in the pinned post.
Promoting OF models is one of the best ways to earn, i see ppl who have OF agencies bank hard and Reddit is one of their main traffic source. Also can be good way to build brand/audience for your new tube site.
I wonder how he got that result, if you don't mind pm me the original post/thread
Last three months Los Pollos turned into shit
but don't hope for much better results with Adverten/Imonetiz. CPA smartlink is maybe the worst way to monetarize, but better something rather than nothing i guess.