I deposited some btc a few days ago and thought to win atleast double it. But lost it in a couple of hours instead.

Havent tried keno before so maybe I should give it a try to see if it is more lucky then the games in which I tried out like plinko and blackjack.

it means that luckiness has not come to you, but it might come another day.
I simply visited gambling sites, and play less than 10 rounds per day, with small
BTC.
Following this rule help don't fall into gambling addiction.
Some days I win more than lose, some days I lose more than win.
Good for you buds, following your system and not to allow yourself to extend out from it gives you a good benefits not to become addicted to gambling, knowing that most of the games you'll going to play inside Stake are all depends on how luck will brings you, setting exact funds and let yourself enjoy will keep you away from too much engagement, win or lose as long as you control yourself to immidaitely quits after reaching your set goals.