Does anyone have good climbing tips?

My best tip for anyone trying to improve at league is focusing on how to CS. Playing this game for over 7 years now, its unbelievable how many people are so bad at lane management, wave management, and knowing how to CS. Also another great tip is limiting your champion pool. I mained lee sin for the past 7 or 8 seasons ive been playing this game, I dont tend to push many ranked games as I get burnt out, but I consistently hit diamond 1 every season. Being comfortable on lee sin, I can play him for any situation and I just understand the champion so well that it gives me a greater advantage over many other players. Which is why I recommend limiting your champion pool.