Safe and best method when gambling is quit while you still win and do not continue, because you might lose bitcoin that you have when doing so, and the faucet is not gambling, but a site that provides coin randomly every few time. But if you don't know about gambling is the best way, gambling like drugs and can make addict
That's the safest, quit when you win... Never boast about your winnings and that you are capable of betting big and go all the way, that would just make you vulnerable to losing and most probably the gambling operator is very happy about your stay so they will treat you very nice...

Gambling sites has all the bankroll to beat you in the long run, and since they create the system therefore they control it. If you can win, just consider yourself lucky as you cannot do it all the time and knowing when to stop is good so you will not be greedy in gambling..