I take the spent blossoms off when they look withered and ugly. I just snap them off right where they meet the stem.
Misting won’t be of benefit, but check if it needs a drink.
Does your pot have good drainage? They like to try out between watering, except, again, they need a little more water when in bloom.
My ‘Miss Peach’ has been in the same clay pot for 10 years. This has been her best bloom-year ever - so I hope it’s not her last! (I started some cuttings for my Mom - I think we talked about that?)
I may repot in claumpots instead of plastic. Also cut off some of the longer arms and try to root them for new plants. Iam saving the dry blossoms to some day try to make flower infused paper.