Affiliates always have their platform where they share their affiliate links.
These includes
- own blog website, where you make reviews and etc.
- youtube channels, where most videos are used to lure people with good reviews.
These two should have enough traffic so that your articles and videos will be viewed.

- become an advertiser, PPC is something you must try ONLY if this is allowed for freebitco as a way to promot links.
This also depends on your budget so you should research websites that has lots of traffic for crypto or gambling niche and make any possible collaboration to the web admin.

As you may know freebitco is known for its faucet, referral/affiliates and it is a very old website. Sure in crypto gambling people heard about them and registered already.
So your very target are the new comers which is more rare due to current market situation.