And at the end... WIN EVEN MORE GAMES
How to become a GM?

Big lie.The only thing to be learnt from losing a game is that losing a game teaches you nothing.Gotta win more games,still!

Some others,insist that at this stage everything is fine,provided you win some more games of course.

I will offer advice with substance taken from titled guys and authors themselves, so if you disagree with me here you're essentially disagreeing with them:
Quite simply, you can't. What do I mean by that? Think of a midget who dreams of being a professional basketball player. At 4 feet tall he simply doesn't have the ability to compete with the naturally tall guys. There are people in the NBA who are 5'9", but they are considered "short" while they're very slightly taller than average compared to the general public, but normal NBA height is probably around 6'3".
Now compare mental abilities. I'll assume you have an IQ of 120, which is higher than the general public, but even this is too low to make GM, since guys who have trained since childhood for many hours a day with IQs of 140 and above (read: innate potential) are competing for GM norms from their teenage years until their twenties.
Sometimes no matter how hard you train you just aren't capable of seeing 30 moves ahead (a whole 60 ply!) and the position in your mind's eye being as clear as the board position in front of you, which I think might be the minimum requirement of a GM's skill level as far as calculation goes. Then you need a great memory to store patterns, judgment skills so when you calculate the objectively best lines you won't wrongly dismiss them as worse than they are or choose an inferior move to it (candidate moves are the base of the variation), and of course endgame technique so you'll know what to do when you transisition into that favorable endgame or save yourself in an inferior one.
Just try to be your best self and not worry too much about norms.
How to become a GM in chess?