Study is very important, learning how to approach situations differently and expanding your knowledge of the game will greatly improve your EV. It is possible to become a good player without study, but 99% of people just don't have the correct mindset and logic to get there on their own.
I have seen players who have been trained by a coach for 6 months and they become winning players online in that time. I have also witnessed players who have played for 12 years and are still losing at the tables, also.. the majority of people are just losing players, that is a reality. The winners are the select few with natural intuition for these types of games, and the rest are players who put in the effort to learn how to win.
Nobody likes to really put effort into things, especially when it so easy to just pass it off as "Unlucky". All losing players are super unlucky, and the sites are "cheating" them, if you haven't noticed LOL. Meanwhile all the top players, all the winners get the same amount of variance and the same amount of bad beats, they just play situations better, and get more value from their hands.
Sorry this was so long, moral of my book here is.. If you want to get good, invest in it, buy a course, actually invest the time and complete it. It will take you maybe 1-2 weeks and you will begin to change your game and start looking at poker through the eyes of a winner.
If anyone is interested in some materials or wants to discuss further, feel free to message me! Thanks for reading!