What to include in a portfolio for a new proofreader?

[gregorypatton97]

Hi. I'm a recent college graduate and I recently opened up a proofreading gig on Fiverr. I think I generally have my profile in check (verified, profile picture, two Bachelor's degrees, certificate in proofreading from Knowadays, etc.). However, after a little over a week, I have only gotten 32 impressions and one click. I believe the reason for this is that my portfolio is empty. Fiverr suggests putting my best work in the portfolio to attract buyers, but I don't really have any documentation of proofreading people's work (I've proofread my classmates' papers and my friend's PowerPoints, but I don't really have anything to upload without doxxing those people).

Is there anything similar I could add to my portfolio? Maybe some of my best essays? I earned my two degrees in English and Sociology, so I have a lot of papers I could include if that counts. Any assistance would be greatly appreciated.