I know that you can sell your bitcoin to trade plattform like coinbase etc.. BUT you need to verify your identify, so it' s not anonymously.
How do you cashout your bitcoins anonymously then?
You can sell your bitcoin anonymously to the merchant near your place, some the exchange have their own teller locally that could be contacted 24/7 just download the apps that are using local merchant in your place, that way you can buy and sell your coins
anonymously but partially you still go outside to expose yourself, so I don't think there will be any other method.