Ways to Help me Improve

Hello guys, I'm a Plat 3 player who just lost 8 games in a row then finally won one. Although every situation was different like 5 deaths in our team in 2 min cuz of udyr invade that the enemy team bandwagoned on, having all the teams kills as mid and unable to utilize it hence throwing the advantage away, or having only assists and trying to make my self useful as adc, supporting an adc that had an advantage thrown away due to an early hook to turret range, and playing top lane while cringing at the fact that every lane is losing. Especially now, it is like the ultimate tank meta (thank you titanic hydra), and I don't know how to deal with these tank comps with bursting mages. I'm exhausted because I know that 8 losses in a row is not luck based factor. I did win 5 games in a row before that though, because I had good players that either did really well individual or carried hard. So how can I rely on my teammates less and rely less on the RNG of which players I play with/ against? (Please don't tell me which champions to play at what meta as I know that doesn't matter much in solo queue and don't tell to git gud, because I already know that but don't know HOW to git gud.) I have the most problems in early mid game where laning phase is just over and the first tower falls.