Welcome, I've been here for 2 months now and I have 53 5* reviews. Heres what I did:
- Add a video to your gigs, this is not only good for conversions but Fiverr seems to like it too.
- Be sure to research and optimise your profile descriptions and images
- Try some of Fiverr courses from Fiverr Learn. When you complete them you earn a badge and this definitely helps
- Same with Fiverr Skill tests, If your feeling confident then take one or 2 of these, even if its just the language tests as these have had a big impact on my profile and rankings
- Lastly, you have to go above and beyond to make your client happy. Because that one client could end up giving you 15 different reviews over time. So make it almost impossible for them not to come back for more of your service.
Hope that helps