I remember betting 0.2 bitcoin at once. I was thinking the simple rule that house always wins. So if I gambled with 0.2 for too long in the end house would have ended up in profit. So I did what I thought was the only chance, put it all in at once and hope for green. It wasn't

Yet I still believe that instead of doing any "strategy" or "tactic" or whatever people are doing, just straight up putting all in and gambling once to make more is only way you can win and leave.
I see some people who do yolo as their style too. But as I can see, even though they hit the green one, win their 'all in' bet, but that doesn't stop them from betting again. Curiosity and greed still exist in them and lead them to gamble again and again. Btw, 0.2 BTC at current rate is a huge amount of money for most of us. And I will never bet with such amount especially with all in style.
That is even a very big amount of money for me, very honestly I cannot afford to lose such a big amount of money. I can only afford to lose 0.005 per day to lose, which really do not affect me financially too much. So I will also suggest you that you should put only such amount of money that you can easily afford to lose.