Do multiple things. Never put all your eggs in one basket. If you have control over the subreddit you can do some of the following things:
1. Partner with an existing OnlyFans model. Agree on a rev share deal and ask her for content to post on your subreddit. You want to use a new account to make these posts. Set up your profile with the model's info and your tracking link. When posting you can go the lazy way by just spamming the link in the comments or you can be creative. Maybe make a landing page. Collect the user's email in exchange for a short 'tease' video. Then push the user to subscribe through your link.
2. Sign up for an adult CPA network. There are a few on this forum. Find an offer that is good for your subreddit's niche. Post an image on a 3rd party site. Put your shortened offer link as the title or caption with a quick call to action. You can apply the same strategy to videos. You can watermark the images/videos to add your link as well.
3. Reach out to adult or dating sites that have a premium subscription. Or reach out to adult toy companies. Maybe even male enhancement. Offer them an exclusive pinned promo post with links + a link in the sidebar for a flat monthly fee.
4. Make an adult website in the niche of your subreddit. Embed relevant videos from popular porn sites. Monetize with everything under the sun. Display ads, pop-ups, adult CPA offers, affiliate programs, and more. Make a script to auto post on your subreddit to drive traffic.
Don't be lazy, don't delay. You wanted details, there you go. Now take action.