Editing your gig isn’t automatically bad. If you make effective changes and wise use of keywords, then you’ll get positive results… if you make ineffective changes and poor use of keywords, then you’ll get negative results. I’ve been selling on Fiverr for two years and I probably tweak something in my best-selling gig at least once a month. If you pay close attention, you’ll learn through trial and error what works and you’ll do more of it.