Whenever you hire someone, you must have knowledge about it. If you don’t have a strong SEO knowledge then how you can sure that fiverr gig is right for you or not.
The fiverr people does not have all knowledge about SEO, they are good in only specific task, for example they may have list of web 2.0 properties, on which they can add your site links for backlink purpose. But they are not good in ON page seo as well. If they are expert in all things, then they can make their own site and earn more money from it.
Pro blogger only hire specific fiverr gig, not all in SEO package. They hire web 2.0 backlinks expert, they hire social signals experts, they hire people who can build backlinks from magazine site like forbes. So if your purpose is hire fiverr people who can do your all SEO task then you’re going wrong. And please don’t ask for suggestion like which fiverr gig is right for you, you must learn your business fully then hire someone.