The reason could be like you might not popular, there could be lot of reasons like some other people might use the same tags,or may be some other ads have them in there tags I think you can sort it out and you need an impressive gigs and if you get a costumer then it might help to get into a search list,there are lot of creators these days and the
Fiverr's Search Algorithm ranks gigs according to the number of reviews you get, your conversion rate, and Gig Tags & Description. One needs to really use their mind to find out the top secrets which can help them rank better.