Offloading monero or any other shitcoin is many times more difficult than Bitcoin. I’ve heard it’s better to go otc for 10 btc
Or even better yet, find someone who accepts BTC as payment. Assuming you are buying something that is like $100k+, which I assume is what you’re doing if you need to sell 10 BTC quickly, it might be less headache to find an acceptor of BTC.