You can trim down the branches to the level that you want. Just be aware you may not have blooms this season.
Also, your soil looks too dense, you have to make that much grittier and coarser, so that you do not compromise your root system and caudex below soil line.
I do not know where you are located, usually I do my pruning while the plant is still asleep in winter, so I do not need to water it, allowing it to stay dry safely and callus all exposed ends. Then I just wait for its gradual wake up during Spring. When it starts to wake up, and conditions outdoors are already favorable like temps overnight at least 50F, then I bring it out gradually, to continue acclimating outdoors and get it to receive full sun slowly. As more leaves grow, the more direct sun and stepping up watering as needed. The more sun the better when it is ready, temps at the hottest it can bear. It is one of those plants that loves our dry 95F to triple digits heat here.
