@Lisa5987 My advice is be happy that you no longer need to chase perfection. We recently went 16 months with all 5* reviews and then got two 4* in a row. There is nothing to be done about it so don't stress over it.
We do try to help people understand the review system by putting the following in our apartment manual
We hope you enjoyed your time with us and will leave a review on Airbnb. The Airbnb system is somewhat strange in that an average of 4.7 stars is ‘the level of performance that’s expected from hosts on Airbnb’.