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There were losing stretches, but you should always think longterm, variance happens. My first losing month came after 3.5 years of betting and it even was two losing months in a row with quite some losses. Was hard to digest at first, but I looked at the big picture. I had won amount X during all those years and now I have lost 10% of that, no big deal and it was expected to happen at some point. I was still confident with my abilities and trusted my system. Took my foot off the gas a bit, lowered the stakes and tried to forget about what happened and have a fresh start. It worked and it took a long time for the next losing month to appear on my spreadsheet again.
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You are saying in the OP, "I am doing this since around 15 years", but since I don't know your age, I can't determine for how long you've been in this business actually.
The thing is that I'm a poker player myself, not professional, but I love Texas Hold'em, and I play this game a lot(I'm in total profit of about 0.15 BTC from 3 years of playing). And I have a theory, that anyone who knows the rules of the game and also has the knowledge of the basic concepts of probability, can be in profit for 2-3 years in a row just because of luck. I came up with this theory not because of my personal experience, but rather after reading and watching videos about famous poker players. Tom Dwan, for example, was losing millions of USD within a particular year, and not just once.
What are your thoughts on that?