How to return Apple Watch Series 10 which I bought recently?

It may be too late, but you can certainly try by repackaging everything together and take it to your local Apple Retail Store (with the original sales receipt) and kindly ask.

NOTE:

You are just past the 14-day return window.

Good luck! 👋🏼😉

Take it back to the store where you got it.

You have 14 days to return your purchase from Apple. That was yesterday.