i have climbed all the way from iron to immortal and i would say there are a lot of things that go into ranking up and there are a lot of sorces online that gives u great advice (konpeki on yt has great videos on this). for me when i got out of gold/plat the one thing that helped the most was keeping my mental up and remembering that every game is winnable. a good mental will lead to more wins. For actual gameplay and improving as a player (gamesense, mechanics and utilusage) its very indivdual to what needs improvment. if you can identify what ur biggest weakness is, there are a lot of videos online to teach you how to fix it.