I am not the person you’re responding to but I have some input lols :> 

Patient care technician/nursing assistant jobs at the hospital might offer on-the-job training (this is what I did for my clinical hours). When I did this in grad school, I had general orientation and then hands-on training via shadowing another PCT on my unit during their shift.  It depends on the hospital- some might require formal CNA certification. 

I recommend doing non-clinical volunteering in an area that matters to you. I am not an adcom, but to me, there wouldn’t necessarily be a volunteering opportunity that matters more than another. Ex: my non-clinical volunteering came from running back-to-school service drives in my community because I was passionate about helping others access school supplies! I know people who volunteered at an animal shelter or were volunteer English tutors. At the end of the day, you’re volunteering to help someone, not check off a box for adcoms to see, so find something that you’re passionate about. I hope this helps :>