Upsolving after contest

Hey , as many people say to improve your problem solving you have to upsolve atleast one question of that contest for eg here is my CF id quagmire - Codeforces
it’s max rating is 1396 and I was not able to solve a question in a contest whose rating is like 1800 /1900 which is too tough for me now as many top coder says you should practice +100-200 of your rating
so I am asking shall I upsolve those 1800 /1900 question?? if i was able to solve all questions before that in contest ?