Straight after my master I took a gap year as a medical assistant and I loved it. I may have been lucky in my case, but I got to see all aspects in a small clinic setting working with a family doc. I worked front desk, did insurance calls, roomed patients, took vitals, got a little of their chief complaints and history, drew blood, ran lab tests, and some days the doctor would have me scribe and shadow her.
Coming into med school, it’s great to see so many applications to what I was doing at work. If you want to take a break from topics within your master, do it. It’s what ever suits you best. I would definitely say do something that you enjoy before starting. I know I gave myself a month trip to Ecuador from some of the money I saved up working before I started school.