@Sharon756
The 4.97 is based on the overall rating given by the guests which is separate to the other 6 ratings.
looking at my little spreadsheet you appear to have been given thirty six 5* reviews and one 4* review. If another 151 guests rate you at 5 * with no more 4 * or less reviews you will return to 5* overall.
Keeping at 5* is realistically near impossible I am afraid.