This a harsh thread for those not used to criticism. The good news, is this phase usually doesn't last long because either the poster quits posting, or conforms to the norms suggested.
Even then, the critique will come. And even if you wear a perfectly tailored and coordinated outfit and you look great in it, if it is a pedestrian brand, the compliments will be thru clenched teeth. Thank them anyway. Be gracious.
If you are chasing a fashion look, this is probably the wrong forum as trends aren't well received.
It would probably help you to look closely at the outfits that are praised and notice how long the sleeves are, how the jacket drapes, how the pants fit, how the jacket accentuates the wearers body, how do the shoulders fit.
Then look for patten, texture, color and how they are put together.
Learn about proportion, balance, construction, buttons, button holes etc.
for example, upr_crust here is an immaculate dresser with a magnificent eye for color and texture. If you check his posts, you will see that he always posts a collage of his ensemble "off body". It's uncanny how he has the perfect cuff links for every tie. Note the brands he wears. Always upper tier but he doesn't chase some recent designer to follow the current trend. He has a style that is timeless. Everything ALWAYS fits properly.
Also, note the ways he maintains his wardrobe. Never wears a shoe with a scuff. Or something with a loose thread or missing button.
Don't want to dress like a mature white dude? That's ok too, but color, balance and proportion, texture and contrast will apply equally to you.
Pick someone whose look you like and figure out why you like. Down to the way the shoes are laced. Ask questions. Pay compliments to guys who are doing something well.
You're a young guy with the potential to look great every day, but it has to be natural or become natural for you to pull off.
Be glad you're learning this now, because dressing well will always be noticed, just as dressing poorly will be. Particularly at the higher levels of management you encounter. I'm 55 and been coming here a year. It's hard when you realize that half what you thought you knew was wrong.
You're ahead of the game
Good luck on the journey.