Get a support duo partner , queue up as botsupport and supportbot problem solved . Think about why what is the comfort that adc role gives you . is it that you just sit back and farm ? is it that when you are behind you can abandon your team , afk farm and when you get back afhter 10 min you can fight 1 v 3 ? is it that there is always someone who will do anything to save you and even die for you for your sins ? is it that your team serves you kills even if you are mechanically bad af and even if you have 050 feeder score lanephase you dont have to feel you could have done more becuase eventually your are the adc and later you picked up 5 kills from teamfights and closeing score was 555 ? These are serious questions to answer yourself , these are the most frequent mistakes what marksman stuck therefore the best way to look where you can improve .