I think you can promote your referral link on facebook not good if you post here because it's not allowed.

If you wanted to promote your referral code try it on social media facebook or twitter.

Join in any bitcoin-related group and how you earn money and give some proof that you earn money then expect that there are many people will ask how you earn a good amount of money just teach them how, but first, they need to click your referral code before you teach how they can join and earn.

there are many Facebook users these days and I think you can get a good amount of referral if you spam them in any bitcoin-related group.

Just keep joining in any bitcoin group with a higher amount of members. However, first, check the rules of the group because sometimes there is a group that they don't allow to post any referral links...