Hi man,
if you are new in poker you must have patience, it is not easy to be a winning player over years because there will always be a downswing phase.
You must be very good in analysis and statistics to improve your game and learn from faults, in my opinion it is always good to play your A-game but there will be a lot of spots where you cant play your best style of poker so you have to be good at improvising your game to the game@your table and be better than your villains - and this is real hard work.
You can try out at heads up poker with micro buy ins there you can figure it out how hard it is to have a high winning rate lets say 7/8 out of 10 games and additional i would play some sit n go´s / small tournaments with 9-27 players and a buy in round about 0,50-2$ - i will promise you it is hard to be a winning player with a high win rate.