When making event contracts, sometimes you shouldn't blindly extend the time interval. For example, here the second to last position is very good, having validated the one-minute level support twice. It dropped and then immediately bounced back, securing profits in 10 minutes. If you extend it to 30 minutes, it stays above for the first 28 minutes, and then drops in the last two minutes. In this case, extending the time actually increases uncertainty and reduces the probability of winning.

Whether to do 10 minutes or 30 minutes sometimes depends on the situation; choosing the optimal one can increase the probability of winning; otherwise, it may backfire. I feel that one hour is too long; I generally only choose that when trading in the direction of the trend, which I do less often.