When I first started on Fiverr, back in the old days, I hadn't really figured out my niche, so I was tossing out all kinds of lines to see how I could get a bite. I'm a good writer, so I thought I might like to do some editing or beta reading, but the market was already pretty full. And I already knew that I didn't really care for being critical (serious personality flaw) and also that a lot of people out there don't want criticism anyway. So I created a gig for beta reading that was exclusively encouraging. I read people's stories and told them what I LIKED, what was working for me, my positive impressions. It was surprisingly popular. Most gigs were advertising for their editing to be very critical, or thorough. I was the only person at the time specifically marketing myself in that category as… nice.
Unfortunately I quickly realized that beta reading is NOT for me.. With my weird brain, some work just becomes impossible for me to keep doing after a few repeats of it. Happily I was trying other things and over time found things I enjoy enough to do endlessly that people like to pay me for. I do still have that gig but it's been paused for like 7 years now.
Another fun gig I had in Ye Olden Days was a Comic Book Styled Business card. It was cute, but way too niche. I think I sold like maybe two of them?