Okay this is the problem:
Now, the normal contests begin in 22:35 (UTC +8), many chinese users like me have to stay up to 11:30.
I don't wanna stay up, so I do the contests when they are before 21:30. But half of them are kind weird so I got negative delta.
When I stay up, I am too tired to do the problems.
So I always cannot get my rating up to Specialist, even through I can get 1500 perf in Atcoder Beginner Contest and 1200 perf in Atcoder Regular Contest.
At the end I wish the contest holders:
plz, make more contests that do not begins at 22:35. (Also for some american friends who can't get up earlier.)