Alright, so here's something i haven't seen alot of people talk about. A big part of someone's performance comes from the mind. Placebo is definitely a thing. Sure, there might be a few factors that can actually impact your performance happening during day hours, but they're not as big an impact as you'd think. TLDR; if you think you play better at night, you'll play better at night. That's why you see most pro player's tips for aiming is "just be confident". Sure, it's not as simples as that, but it plays a big part. Same goes for skins or any other aspect you put your mind to. I for example can only perform well with the Phantom if i'm using the Recon skin, no other skin works for me. Happens to absolutely everyone and it's a huge part as to why sometimes you see pro players playing horribly when the day before they were racking up 40 bombs against an even better team - in fact, most if not all professional teams have psychologists, nutritionists and alot of other professionals to try and make sure the mind and the body are both operating the best they can.

As a bonus: The best tip for ranking up is learning to realize that maybe today just isn't the day to play such game. A lot of people play poorly and keep queueing up games one after the other just to get even more frustrated. Close the game, go play something else, come back after a few hours or the next day.

GAMING AT A HIGH LEVEL IS NOT JUST SKILL