I think, first of all, it's important to understand what "holistic" truly means. Many people believe it refers to an "all natural" modality of healing; one without modern medication. Holistic treatment in medicine simply means treating everything as the sum of the whole; it can, but does not necessarily, include naturopathy. I tend toward a holistic approach in my disease management; healthy diet, regular exercise, cessation of habit forming substances (including caffeine), stress management, and appropriate medication. If you have PsA, the likelihood of managing this disease will be severely hampered without the appropriate medications. And one who is solely a practitioner of holistic care will be unlikely to have the necessary knowledge and/or experience of the disease to help you in the best manner. I'm not knocking holistic care nor its practitioners. But there is a time and a place for everything, and having PsA is a time for drugs to treat it.
PsA can linger for years as something that causes only mild pain, easily dealt with by taking OTC pain relievers. But it can progress into a destructive phase almost overnight. You can go to be feeling fine, and wake up in the morning with something that will cause the destruction of a number of your joints within a very short time. There is more to PsA than the joint pain. It can also effect the organs; lungs, heart, kidneys, gut, brain. So, by all means, be holistic in your approach to disease management. You should be. But holistic can also include things like Methotrexate, Humira, Cosentyx, Skyrizi, Otezla, and the list goes on.