I would just create a new topic each month named “Join MONTH Meeting!!!” with the link in it and put it in a category where the people who you think care about this are watching the category (or watching first post).
That’s great news! Then people don’t have to look at the thing after they know that the meeting is going to happen and the zoom link exists. But if you want it to persist so that people just program their own brains to automatically ignore all of your pinned notices, you can change the settings as suggested.