Can I add my portfolio site link on my profile description and Gig description? for example, I have a services provider site and this site has a portfolio section. can I use this portfolio Link on the Fiverr gig?
Can I add my portfolio site link on my
So long as your portfolio’s listed in the allowed list of URLs at the bottom of this page you’ll be fine. 
https://sellers.fiverr.com/en/article/seller-faqs