I am doing quite a bit of theme CP and Gitgud these days, and while my performance is mostly around specialist level, I am good at some topics like graphs (rating <= 1700; I can guess the solution in 5-6 min, but implementing is another story), so the topics I am very weak at are constructive and implementation. Even after thinking the solution is silly, mistakes in implementation are taking my too much time during contest, and also constructive breaks my back frequently. How to improve? Shall I really solve topic-wise problems or keep doing random ones? I have been trying for a week, and constructive is demotivating me.