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 of course cannot stay totally anonymous if you want to convert your bitcoins to fiat because for that you surely need to sell them to someone and for receiving the money you will need to give your account information and that is also a part of not being anonymous. Though you can be somehow anonymous like not giving away your ID and phone number etcetra. You can sell your coins in localbitcoins.com where all you need to give is your account information to the person you are selling your bitcoins to.