Hi @Eman_Ahmed , welcome!
I believe you can assign yourself to the topic. Click on the Topic controls > Assign > Add username and message.
You can access all assigned topics by clicking the user sign with a + sign in the notification sidebar (at the bottom).
The only drawback is that there isn’t a timer. You will just have have follow the same steps and click Unassign to unassign yourself.
Hope this helps!