I noticed one thing and that is, when your level upgraded you loose rank, the other thing is buyer's personal feedback to fiverr. Provide maximum satisfaction to your client so they tell positive about you to fiverr! Good luck!
write your main keyword in description, Please don't do keyword stuffing but write in a good way! and also in tags. And being active gives you one advantage and that is when the buyer put the filter your gig might come up to him!