Travis, I feel for you, I had to retire early due to complications with cf, I also do not like to take all the meds I have to take and also suffer from abysmal vitamin d levels.
My body has a hard time digesting and breaking down vitamin d for absorbstion so my primary doctor (been with for 25yrs) suggested I be outside in the sun as much as possible, this is how my life changed for the better! So much better, I started gardening! I feel better (and my condition isn’t very promising) and my vitamin d levels are better. I have even noticed a decline in general health with the winter shutting me in, but look forward to spring and my newest project, building a small cold frame!
So, anyway, probably the best drug free help may just be getting as much sun as possible, it has helped me immensely! Good luck my friend 😎