There is no roadmap suitable for you unless you are comfortable with it. It varies, I mean. Maybe my roadplan is not suitable for you. But for a common roadmap, you can check USACOguide. All you need is consistency and commitment. Also, set some higher goals. Green is not that hard; you just need basic math, which you probably have knowledge about, STLs, and some implementation skills. goodluck!

I think binary search and two pointer will help you so much and learn math ,number theory alot that will help you good luck