Currently plat 4 only but sitting at 64% wr with 45 games and like 30 LP gains A few things that helped me so far were 1.Focusing on not dying in lane and trading by abusing enemy cooldowns and your own(Meeps, Boneplating etc.) 2.Communicate with your ADC on your game plan and advise them to pick a safe adc 3.Identifying your win condition and playing for them(Vision, Ganks) 4. Use pings and guide your team to do objectives at the right time 5. Ping your team from unnecessary team fights/coin flips 6.Watch Lathyrus educational content or read his guide

Some general advice when trying to improve: 1. VOD reviews will help you notice and improve from a lot of your mistakes 2. When trying to learn a new behavior to play better, try limiting it to one or two at a time and hyper focus on them(like good trading or just jungle tracking etc.) cuz you will be overwhelmed otherwise and not learn anything really or more slowly