I went all in on Argentina thinking their match against Saudi Arabia would be an easy win for them, and the fact that the odds were so far away against Saudi Arabia winning while it was in huge favor of Argentina caused me to be so sure that Argentina was going to win the match, and then, I went all in, hoping to make some big wins just like yesterday, but now, everything is gone, in just a twinkle of an eye...
Argentina is a big disappointment, It's still hard to believe, I quit betting until I am able to forget this experience entirely.
I'm sorry for your loss, but in any situation when you go all in there is a possibility of losing. So if you have some kind of betting strategy then all in is not a valid choice as there are no guaranteed bets (unless it's Bayern's Bundesliga title hehe).
To some extent, you are lucky (it would be much worse to lose everything + all the winnings in the last World Cup game), and now you can watch the games of the national teams without distraction and have fun.