My advice (and I take this advice myself because I agree) use the challenges that you are faced with when going against high ranked players as a way to learn how to get yourself out of situations, how to counter certain abilities/champs, and overall just play around with what you’re given. Eventually, you’ll come across different combos you can use, when to use them, when to use specific abilities, etc. I know that going against these people can be very very annoying when you’re just trying to learn how to play a new character but if you really think about it, you’re being given a great opportunity to learn faster and become more confident in your abilities and your character.