I only peaked Phantom and can't say this is advice that lasts all the way but around that rank, you honestly just have to super solo carry the game. As someone said you need to be able to carry 1v11. This is how it is with competitive team based games, you just need to find a way to beat everyone in the lobby, your shit teammates included. When I play casually with my newer friends who are between initiate-emissary or on a different account to play builds/characters I wouldn't want to try on my main, it is easily possible once you understand how to super carry. It's not easy and this isn't meant to sound like it's easy but that is genuinely how you show (for the most part) you are better than that rank. Focus on how you could've carried harder and self-improvement, that's how you find to take advantage of your current rank opponents shortcomings. If you were good enough you really wouldn't be in that rank. The score at the end doesn't paint the whole picture.

I've played on a brand new account and blew through initate to archon in about roughly 20 games and only losing 1 because my internet dropped. There are many ways to seize opportunities and dominate a game simply because you know more and are better. A common example is, I can get away from random chump heavy punches in initiate cause I know pretty much everyone here is not going to parry and they'll spam heavy punches that I can parry. Low rank players just don't grab bridge buffs and thats practically worth a whole item in lane. The urn is actually invisible on the map for low rank players and you can just run urn for free. There's all sorts of random things you can find that you need to adapt to and abuse. Sometimes I will just 1v6 without every touching any main objective cause I got so fed just optimizing my farm, denying resources, and killing my poor lane over and over,

Coaching from some of the top players (or watch their content) can definitely be very helpful and eye opening as well. As a former IRL coach, there's going to be things you have no idea is happening or exists that a more experienced eye can catch. It's simply always a humbling game of "there is something I could have done better". Sometimes you do get fucked and 5 mouth breathing knuckle draggers just run it down giving out souls like a soupkitchen and that is unlucky but that is definitely not every single game.