Note: This feedback is directed at you in specific based on your stats.
- 2 control wards per game minimum, no excuses.
- Your positioning is your largest weakness, to an EXTREME. Stop overextending without vision.
- Semi-related to both the above, but less late-game oriented, you are one of the worst players (bottom 1% in the entire game) when it comes to surviving ganks. You need to focus on that specifically and be mindful of it regardless of HOW you do it, this needs to change. (bottom 1% means even some Iron players survive ganks better than you).
- Again related to all the above, your solo death rate is one of the worst in the game, you are not Chuck Norris, chill.
- Your total number of deaths is just WAY too high, this is mostly mid-game, but some late-game as well. I suspect you're a split pusher focused player that just isn't very safe about it. I feel like this extends from you smashing your lane and continuing down it without considering other options or vision as you do so well against your lane opponent. In addition to the pinks mentioned in #1 you may want to consider a blue trinket to get that vision out rapidly at a range for split pushes. In addition, you may want to consider playing with your team more to test a bit of an alternate playstyle.
There's other stuff, but this feedback is hyperfocused on your largest weakness due to it being quite glaring and extreme, I think it's best to focus on that for now instead of trying to do too much at once. Besides, you can always ask for more once you master that.
As far as your rank goes, I suspect a lot of it comes from you just stomping your lane opponents faces in (GJ on that BTW) You just need to learn to safely carry that lead through mid-game and into late-game. Make sure you continue to perform there and try to make sure you utilize that lead to take Rift Heralds and get plates with allies so they can keep up with you.
As far as professional advice, I'm gold but you're gonna get the same feedback if you pay a challenger for it.
Actually, I've seen a few challenger reviews, and they tend to not dig this deep, likely you'd get the "2 pinks per game, and stop overextending, try to drop your death rate to mid-game to below 2" and that's it lol. (You're currently at 4.3) I don't want payment, but I suspect you'll ignore my advice anyway as I'm gold. You got way too much room to improve the points I hit on to bother asking for more for now TBH, because that alone should do you a world of good.
That said, I don't think you need specific coaching TBH if that's what you're looking for. There's a lot you can improve without it before ever considering opening your wallet.
However, if you want some popular trusted paid challenger reviews just let me know, I can point you to ones who will happily take a few bucks.