To reactivate your account, please check why it was deactivated first. The deactivation reasons include:
1) deactivated by yourself
2) deactivated due to security reasons by Alibaba.com
Scene 2: Deactivated due to security reasons by Alibaba.com
There is no "appeal for account reactivation" entrance on the sign in page: go to Alibaba.com Customer Service to get more support.