Hello everybody! This is my second account and I want to upgrade my skills of solving problems on codeforces. On my first account my maximum rating was at 1315, despite on my rating I know many algorithms like dfs, bfs, dp, segtree, sqrt-decomposition, binary search, disjoint sets union and other popular algorithms related to graphs. However, I use them rarely, because of, intresting and difficult problems rated approximately at 2000, but, I have some problems solving div 2 C, so I have started solving 1700 problems, but, I want to ask from experienced competitive programmers are there any other ways to upgrade my skills essentially?