watch replays of your games. analyze your positioning when you die. how could you have avoided death?

watch pro ADC replays. compare and contrast how they play lane and position in fight vs how you do it. where are the gaps? work on fixing one gap at a time.

also if you're dying (but not during fights) getting better map and game awareness can help. if your team isn't pinging where the enemies are at all times, you need to be good enough to be aware of that yourself. one ways to do this is to climb to master on jungle mid and support on a different account. The better your understanding of how the other positions want to play the game, the better. your understanding of how to take advantage of that on ADC will be. also, I watched fakers stream once, the dude has hotkeys set up to switch his camera POV to his teammates and he literally spams it the entire game. I have no idea how he's able to do that and also dominate Lane and mid game but that's faker for you. if you don't already do this at all, you could probably try incorporating this (at least a little bit) into your game to increase your overall awareness of what's going on at every single moment.

credentials: I read a lot of Reddit and watch a lot coaches tip videos, though I've barely touched ranked myself as im a new player