There is not a magical way to do that. I have been doing active promoting for different type of Crypto currency related sites for many years. So based on my experience, i can give you guys a few important tips.

- Persistence is very important. Earning refferral is a difficult and slow job unless you are willing to spend money for advertisements. So, pe patient.

- Use social media in a smart way. When to post, hashtags and posting other thing and not only your adds is important.

- Make sure to understand and analyse your audience. For example, if you are promoting a faucet, you might get more interest from people in India and Russia rather than USA or Canada(hashtags and targetted adds are important at this point).

I will try to edit my post if i remember more.