If you are looking to sell, then I'd definitely go with a P2P option of some sort.
Obviously Localbitcoins would be your first option. However, just make sure that you do check on the reputation of the buyer before you sell your coins, and also ensure that you're getting a relatively safe payment method (For example, paypal is not safe as it is completely reversible). You can also trade p2p with a range of users on this forum, however, the rates are generally very bad. Other options like Paxful, Hodlhodl and bisq can also be considered.
Though if you want PM, Advcash etc. go to bestchange.com. There is a list of them that are generally anonymous. Selling BTC anonymously is much easier than buying, so you do have a lot of options.