@Tendi-and-Bukit-Vista0 I'm not sure what you mean. There's nothing to do after check-out that would lead a guest to leave a better review. It's what happens during the stay that affects the review. If a guest feels they have reason to leave a less than 5* review, there's not much you can do about that.
You have 321 reviews, and while I didn't read through all of them, the ones I did make it apparent that your guests are quite pleased. I did see that one bad review, but it's an outlier, so most future guests will dismiss it as the other reviews paint quite a different picture.
Don't get too hung up on being Superhost- it's really not a big deal. More of a carrot Airbnb dangles- behavior modification tool to keep hosts jumping around trying to please even the most demanding and rude of guests. Hosts who have had Superhost and lost it say it didn't make any difference to their bookings. Ratings don't really matter, unless they are really low- what matters is that you have satisfied guests and that you get bookings.
Some hosts do try to educate guests in various ways as to how the star ratings are applied to hosts- many guests think that a 4* rating is fine and they simply don't know that Airbnb considers it a "fail" for hosts.
Try doing a search on this site for threads that deal with star ratings and educating guests. Some hosts really oppose it and think t's a bad idea that can backfire, others do it with good results.