Counter-question for you: If you have thousands of referrals on that faucet then you already have a successful method to achieve your goal - your question is very strange to say the least. What I guess you already know is that if you're looking for faucet referrals, then you're targeting a specific audience - advertising on other faucets and services like faucet microwallets is certainly the best way - although some use methods like spamming potential users using publicly available databases - which again raises the question of how much someone wants to play fair on the road to success.