More I read, more I see that trading in a long term is not profitable. So, I wonder are there any profitable traders that make money on the market constantly and sustain decent lifestyle? I am not looking for big money, let's say 2k or 3k per month would be enough. Is this something doable? Is there any strategies to become a trader that makes this amount of money?
Long term or you mean short term? What you should know is that trading as means of living is subjective. Not everyone can be successful in trading, so when you see opinion about things, you don't just make conclusions straight up. Try and make more enquiries before you make conclusions else you might miss out on some opportunities. What I know is that trading is profitable in the long run and also on the short run just like the way we are having bull run right now.
When you check Bitcoin volume on any exchanges before now, you will see that there was billions of Bitcoin been traded everyday, that's tells you that there are people that open and close positions on Bitcoin everyday, not just Bitcoin but across all over crypto markets. If indeed crypto is not profitable in the long run, I'm not sure they would have come back and also imagine a trader that has opened position or trade since January, they will be on huge profit now depending on their leverage.