I think that in order to sell bitcoins you need to find a crypto exchanger. I know that you will find the highest rates on this site
https://hiribi.com/ , but I advise you to check it and read reviews about this exchanger to be sure of the reliability of this site. I know that the paypal payment system blocks transactions on suspicious sites, so so many sites don't allow using the paypal account, but it only tells me that this site isn't verified and I don't want to risk my bitcoins, usd or personal data, so that I choose only trust resources for this.