Hospice - helping people navigate their own impending death gave me some perspective. I did it for a few years in my early 30s and had both elderly patients and some younger than I. Pretty intense but the training was great, I was highly valued by the patients and their families, and it really made me think about not wasting the time I have on the planet, however long that should last.

I was a musician at the time and, like you, thought, "I should do something with my days since I have so much free time."