How can my site members delete their account on my site?

Hey there. As the new gdpr law is valid now I am wondering how my site members can delete their acoount.There should actually be the possibility that my site members can delete their account without writing an email to me and asking for getting deleted. The problem is that my site visitors obviously cant buy anything without an account. Am I right? So that means for me that I have to possibilitys. 1.) My site has to be offline until U guys doin something so that my site members got the right they should have after the new law or I have to find a new host which is offering a gdpr conform website.