Many high rated users on codeforces have advised me to solve problems which are higher than my rating. https://clist.by/ has a great "luck' parameter. If the luck factor equals 50%, then it means the rating of the problem equals your rating. Which range should I set the luck parameter to when solving problems? (like from 40 to 50, 30 to 40 or something like that)

https://clist.by/problems/?search=&luck_from=40&luck_to=45&status=&chart=