should i do just the same to promote my gigs . I mean like article submissions and seo in general .
Yes. But make sure that wherever you promote your Fiverr™ Gig™ that the only way to contact you is through a link to your Fiverr™ page. They get very snippy if you even give the tiniest, slightest impression that you might communicate outside of the Fiverr™ system.
[Edit] Unless of course you get permission first, in which case just about anything goes.