Alert remind

pressed a notification event previously.

Has that been stored somewhere? This would be a requirement so that this can be queried.

if it is possible to show an alert reminder message to a specific user

Sure, the question is when that should be displayed. Let's say, if you want to display a message after user login, then you could start your ECA model with that login event, then read the information from the database, whether that user "pressed a notification event", and if so, use the message action to display your message.

If you don't have that information in the database yet, you would have to do that first. That information could e.g. be stored in a field with the user entity. But the decision depends on the details of your use case.