Connect your X account and switch automatic sharing on, and a new wish is posted for you when you publish it. It is off unless you turn it on.
Open Auto tweet settings from your account, connect your X account and switch it on. From then on, publishing a new wish posts it for you.
It is off by default
Nothing is ever posted to an account you have not connected, and nothing is posted while the setting is off.
What is posted
The listing you just published, with a link to it. It is not a feed of everything you do on the platform.
Turning it off
The same switch. Turning it off stops future posts; anything already posted stays where it is, because it is on your own account and ours to remove is not.
If a post does not appear
The commonest cause is the connection having expired at their end. Disconnect and connect again from the same screen.
If you would rather tell people yourself, tell your supporters sends a message to the people who have already bought from you.