Can I get some climb advices from diamond+ players ?

Can you guys tell me what did you focus on the most and in which areas you have to get better for climbing diamond++? I was d2 then I got demoted all the way back to d5. I was de-tilting for the last month and I'll start climbing again soon. I'd appreciate any advice I can get to reach d1 at least. I'm a support main this season btw.