You throw 4 times for x 5 , and then rised on x 20 !?!?!?!? I had more then 20 reds on x 2.3, what to say more, this is dice game. I don't knkw what you expected with this strategy, but for sure you would lost everything eventually. Betking have a minimum bet for roulette 0.0001 so with your money you could play martingale easily,  even their dices are 0.000001 minimum bet. For martingale strategy you need to choose lowest possible bet, so you can double bet amount every next throw.

I'm sorry for your big loss, I hope you will not be stressed to much. And I hope you leaned something about gambling. I know you would win nice amount in case you hit x 20 with your bet amount, but take it easy. That's why gambling is not just luck, you need to learn how to gamble and win.