You have to talk to Adobe's customer support. They're the only ones who can reset the number of activations.
Click the following to contact Adobe customer support staff for help: https://helpx.adobe.com/contact/support.html Please signed in with your Adobe ID and allow cookies in your web browser for this to work. The link refer to the US website. If you are not located in the US, the site should redirect to the page appropriate to the region associated with your ID. Click the chat icon at the bottom right of the page to open a chat session. Typing AGENT into the chat window should connect you directly to an support employee.