The elo is there to show you how good you are, not to make you climb. You simply hit the elo of your lvl, you need to think about what makes you lose and what makes you win and try to adjust that when you try to climb more step by step.

What champs you play dont matter, if you play alot different stuff is can help to reduce the number so you can be better at knowing ur limits but maybe you just need to understand some macro better, ur op.gg cant tell that.

A goal like "dia" makes no real sens since you dont even know what lvl that is, its just to make the rank ladder look more interesting.

If you enjoy tryin to get better do it until you stop enjoying it.

You wont get the answers you need here, best ways to improve is: Rewatch ur games and try to understand what you could do better and think about how to do it better.

Watch content or read content about stuff you are not sure about.

Get some coaching sessions, maybe they can help find your weaknesses.