Sadly there is no secure options here beside faucet a.k.a freebies which is a no no for me but if you want it then you can check it because it's free, only take a little time to earn some sats but the amount is really low. There are so many ways to increase your bitcoins though, you can do it by trading, gambling, investing on IEOs and ICOs, and also get referrals on gambling site or trading sites for passive income.