You could create a board where each item is a board with a link to that board. This could give everyone a reminder and link to each of the boards they have access to.
You could create a Document in Monday and make it sort of your “hub” page and have links to all the boards needed by a certain team. then you could pretty it up with titles and other verbiage.
Indeed, I have considered option, but I prefer to use a document with links if that is the direction.
However, this is also an issue because clicking on links inside a document opens a new browser tab.