I just finished Codeforces Round 1065 (Div. 3), and it was a wake-up call. I couldn't solve either of the two constructive problems (E, F).

When I see a constructive problem, my mind goes blank. I start guessing patterns randomly, which never leads to a solution. It feels like I'm just supposed to magically "see" the answer, and I always fail to find a solid starting point. Before I know it, the time is gone.

How to improve my constructive skill? Any advice would be greatly appreciated. Feeling stuck.