gambling is best. but dont get too greedy, quit when you got 50%+.
Gambling is also the best way to lose your money instantly

So it's not a good suggestion , do not gamble to grow your bitcoin unless you are desperate to be rich instantly

Just gamble for pleasure
stop when you got 50%+? or when you lose 50%+? its hard to earn from gambling, the house will always win and if you win its just for a few times and lately you will lose.
Stop when you first think to join into the gambling industry that's what i suggest to my friends.
I think that it makes you very addictive and don't let you go, and that's the worst way to lose your money.
I prefer more to invest in startups, in new coins to develop for a long time and support them.