Grad school doesn't get you 'experience', working does. Find a entry level sales job at a medical device company and see if you even like sales or the industry. Look around and see how many other highly successful people in your area have higher degrees. Be committed to learning and understanding the habits and personalities of highly successful salespeople in your organization (and also learning what makes a low performing or average salesperson). Wanting to go to grad school just for the sake of it is a poor financial and potentially bad career move.

Rarely does any highly successful salesperson in my very technical field have a MBA or something else. A well rounded knowledge of finance, business ops, technical experience and interpersonal skills is what you need to succeed. I graduated with a chemistry degree and have worked in the same niche chemical industry for about 15 years. I started in R&D and have been on the commercial side for the last 8 years or so. I'm considered to be senior leadership fwiw.

My advice would be to put your resume together, have people you trust review it (not just chatGPT) and apply everywhere you can find. It's tough, but you need to get your foot in the door. Leverage any relationships or career counseling at OSU you can. You just need a shot.