Hello. Hope you are having a great day. I agree with those who have answered this question that you can only obtain 1 Fiverr account but within that account you can still offer any services you are skilled or good at (so it doesn't have to be just 1 service category). According to one helpful Fiverr customer support member, they said that new sellers are only able to create 7 gigs/services but as you continue to level higher, you will be able to create more gigs (offering a lot more services to potential clients).
I hope this helps 🙂
Kind regards,
Caitlin