How to prune azealia?
How to prune azealias
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This may be helpful. I wouldn't prune them till after they finish blooming this season or at least not in a major way https://www.hometalk.com/diy/grow/flowers/how-to-refresh-old-azaleas--18899816
How to Refresh Old Azaleas!
The best time to prune azaleas is after they bloom in early summer so you don't remove any flower buds. Here's a link on how:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/pruning-azaleas.htm
The top of your shrub looks fine but you may trim the base area a little by cutting back only enough to get a nice shape.