@Bob-And-Anna0 The guest actually receives several automated emails from Airbnb, nagging them to leave a review. I really don't recommend piling even more on top of that, as they might feel badgered and adjust their opinion downward.
Your reviews and ratings are fantastic as they are, and the overwhelming majority of guests won't be deterred from booking just because that little badge isn't on your profile for a few months. I'd let it go; if the guests really want to leave a review, they'll do it on their own initiative.