Already leaved insider build why still receiving updates?

I have signed up up for windows insider beta channel and immediately opted out but I am still getting insider previews why is that how do I fix it?

It said my device is queued for unenrollment but I still had to install an insider preview afterwards which I really wanted to avoid.

Though right now I don't have any immediate problems, I still don't want to keep getting new insider builds and leave Windows Insider Program without reinstalling what is the safest way to do so? should I wait in for a big update or is there any other way??