Your gig looks great, your profile shot, everything. It all looks great. Your voice sounds great. Your problem is none of those things.
I have theory, which I espoused a couple of times on here before: As Fiverr approaches its eventual IPO/buyout, revenues are becoming very important. Revenue divided by impressions is the ratio that makes Fiverr favor one gig over another (as logically it should).
Your gig is waaaaay cheap, but your gig options are expensive. This creates adverse selection (upsells are always easier to close if they are small in comparison to the base price), so that your average transaction price is quite low. (I know that I don’t really know this. But I’m guessing your average ticket is significantly lower than mine, and my gigs rank extremely well. And so I sell a lot of stuff.)
If I were you, I would:
Raise your base price to $25, but keep the incremental cost of additional words to $5.
Kill most of your gig extras, like commercial rights. What’s it to you how they use your clip?
Create a new somewhat-unique voiceover gig every week for the next few weeks. They will get rotated into the top of the search for a few days. (Don’t you love how Fiverr does that?)
Re-record your gig video to start it with a USP (“I have been told I have the most beautiful voice on Fiverr”), go to a call-to-action “Order now. I promise you won’t regret it. :)”, and only THEN start your portfolio clips.
I am pretty sure my little plan will work. Best of success to you.