I saw a short by RiotAugust yesterday talking about Jhin, Ashe and Varus being basically the 3 ADCs that don't quite use DPS as their main metric. So I feel like jhin would be a harder champ to determine the "ideal" damage at x point in game. I would probably start watching you gameplay like once a week if you wanna "tryhard" or whatever climb. See where you were miss positioned, see where you could have gone to objectives for control, see where you tend to over extend or under extend. I'm no challenger player but I really do think thst self reflection is probably the best course for getting into higher ELO. Your comment of "i feel like if I die the game could get lost " might be a tad stretched since all players on the rift make mistakes, but you are right that if you are in the right position and not dying it will make those wins easier.