I can totally understand your frustration. I would consider these thoughts.
Are you enjoying your time? If so, don’t quit … If you are miserable you may consider finding a different avenue…but first figure out WHY you are miserable or unhappy. There are plenty of people with gigs that are thriving!
Are you unhappy, currently with Fiverr, because you are lacking sales? … If this is yes, I would suggest finding other ways to market your gig. I.E Blog with a link to your Fiverr gig, Social Media, Warm Market, Reach out to previous buyers in a friendly manner.
Is Fiverr to blame or are you putting in minimal effort? … I’m not judging, and I’m not an experienced Fiverr seller, but I do have a lot of experience in running my own, successful, insurance business. When I was feeling “stuck” it was usually because I was not putting in enough time or work. From my understanding, this platform does not favor one who simply puts up a gig and waits for people to click…Yes, you will get sales, but you do need to market.
These are a couple of things to consider. I also recommend a book called The Dip by Seth Godin… It talks about the right and wrong time to quit.
Good luck and I wish you much success!