You can compete with experienced sellers by being faster, offer more for less money, being on-line regularly to answer potential questions, etc.
You can also go and find a buyer off of Fiverr and bring them to the platform to get your first sale or two… nothing helps jump start a gig more than a couple sales, even if you bring them to the party. (Do NOT have your relatives by gigs, find someone who needs your services off of Fiverr, and direct them to your gig.)
Fiverr won’t give you lots of exposure at first (they have no idea if you’ll be around in a month) so see if you can find one buyer each week and use them to get started, get a few reviews.
If your service has value, then there are buyers both on and off Fiverr and you can find one or two who need you.
Also, considering creating a gig video that shows off your squeeze pages or other offerings in a more dynamic way. The visuals don’t need to be huge, just panning around the screen showing off the value of your work… (music and voice over optional, but when you can swing it, a win for you…)
Forget the experienced sellers EXCEPT to learn from the way they present their gig. Do NOT copy from one of them, but find a dozen you like and then create yours with the best ideas from strong sellers in your category.
There are many paths to success, getting started is a challenge we all go through…