You should specify what country the phone is located in (I presume the US) and what countries you are prepared to ship to.
Also, I doubt that the AweSIM Service can or should be sold or transferred. So you should just cancel the service and exclude it (and the SIM card) from the sale.
Ditto the PureOS Subscription - unless you want to continue supporting the development of PureOS despite selling the phone (which I’m sure would be welcome).