My account was unblocked today, it took about a week and I appealed twice. The account was registered in the second half of last year. A simple analysis shows that, indeed, as my account name suggests, the limit orders were executed too quickly, and when some sell orders were partially filled, they were opened as sell orders, leading to self-trading and being judged as a violation. I stopped trading for two days in between. Perhaps the circumstances were minor, and after the second appeal, customer service judged that there were no other violations, so they released it. If there are other reasons, everyone can discuss in the comments.