I have good math contest background (I can solve IMO Shortlist C5-C7 with 60% success rate, went to national Math Olympiad Selection Camp in 2018 summer). However I don't have much CP experience.

What should I do to reach Codeforces Orange and USACO Platinum within christmas ? Currently I can solve ~2 problems in USACO (new) gold and looking at past codeforces problems I can solve 4-5 problems very easily (within 40 minutes) (but I have difficulty implementing them: https://codeforces.com/blog/entry/61899)