I have been earning BTC through different claiming faucets like BTC clicks, Freebitcoin, Bonus bitcoin, adBTC, Moonbitcoin, Fieldbitcoins with no referrals for about 4 months now. It is so hard. Can someone tell me how can I earn more?? 
You must also join different bounties here at the forum you can earn not only bitcoin but also token that you can sell later to eth or btc. Try to level up your rank so that you can join signature campaign in this forum. But first you must read this before you join any campaign https://bitcointalk.org/index.php?topic=1684035.0.