I have contact to the Support Team,
their final reply was:
Sorry, your traffic in general is just not acceptable. Your skip ad click rate is only 6% and your mouse move rate is only 8%. Only 9% of your visitors complete the wait/countdown.
However, I don't know why my traffic consisted of high amount of empty referrels before you tell me the truth.
I replied to the Support Team, I said that I strongly beleive that some visitors hack my link and cause such problem.

However, I did not receive reply from the Support Team anymore.
So I post this message to the forum.

I sincerely hope that you may provide an opportunity for me to correct my mistake.

I must make an declaration for my visitor from stopping to hack my links.

Would you please consider my situation, temporarily disable my "limited status", and give me a "final chance"?

Thank you for your attention!!