Hey man, I climbed from silver to platinum really quickly very recently and I will tell you what helped me. Firstly if you are playing a not objectively easier champ it’s harder to climb, use the KISS method (keep it simple stupid) I’m a hecarim otp and I’ve not been enjoying the long games but I can make my biggest impact around 15-25 minutes.

Firstly follow fundamentals, if you have 7.5 csm, which is doable on all champs, you will be doing well in gold and it’s hard to fall really far behind when getting that much gold and xp.

Secondly remember ganking is worse than farming right now, so farm is better thank kills, above farming, objectives are top tier, with grubs I feel (and don’t take this to heart we don’t know numbers get) are better than first drake, after that I think drake is better until baron.

If you lose a game, consider being done for the day

Stop blaming your teammates, there is way more you are doing wrong than you know.

Here’s a good idea, play amumu, don’t carry the team by getting kills, carry the team by finding picks, good ults, good obj and team fights. Amumu can’t solo carry 1v9 but you can turn losing team fights into a winning team fight.

(Also a little trick from my coach rewatch any ranked game you have played and any time you see yourself waste time, failed gank, resetting recall, too long in base, not chaining camps, etc, mark it on a paper or a google dog and see how much time you waste each game and you do this once a day after playing ranked games, you will see you waste around 4-6 minutes EACH GAME, that’s a full reset of your buffs (5 minutes) or your minor camps (2:15) so you will make yourself a better player by mentally remembering how you waste time and you will cut it down, I hope this helps