Where can I sell Optimism?

Excuse me, could you possibly tell me where I might be able to sell Optimism? I've been holding it for quite some time and now I'm considering selling it. I've looked around online but haven't found a reliable platform yet. Do you have any recommendations? It would be great if the platform was secure and had a good reputation in the cryptocurrency community. Also, I'm looking for one that offers competitive pricing and smooth transactions. Could you please guide me in the right direction? Thank you for your time and assistance.