If possible I think a pop-up modal when you visit the site would be nice to have to show members that a new announcement has been made and to look at it. If they visit the announcement then the pop-up modal should no longer show up for them.
@TUTProfessor hey can u open pm for all members or atleast we can contact to admins. As I have some courses that every might wanted to get public but i dont have time to make new resource and its uploaded on gdrive. Or if u are active on Tg i can contact u there.