Serious question: good guides?
Greetings fellow summoners, Serious question here: Are there any good guides anyone knows of for how to critique your own games (find mistakes, etc.) and how to progress out of Bronze ELO? Here'es the problems I have been having:
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Guides I find are either just people bragging on their own skill or Diamond+ summoners showing games vs other gold+ ranked games. Not vs Bronze
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Tips I am finding seem to fail vs Bronze players due to Bronze players are kind of erratic (example: tips say "ward here or at blank time begin helping other lanes... but when you do those you find yourself ganked because the other team [or your own] are in a completely random spot and not where they SHOULD be)
I am a support main (usually Leona) and find myself losing games when I am 3-1-13 or 5-2-20 at the 20-25 minute mark, but team-mates have like 11 deaths each. I am trying to find my own mistakes and help correct my play as it's the only thing I have control over, but keep seeming to draw lop-sided games or team mates who don't want to play as a team every 4 or 5 games out of 10.
Anyone help? Sites / channels / guides with good guides to help?

for example are damage supports than can carry. They have stuns/roots, but they'll kill enemies by themselves. Mages basically lol.