If you have Facebook that would probably sell quite quickly on there, or Gumtree. Then if it doesn't pop it on AT. But as the other 2 are free it's work a shot. I've sold all mine over the last couple of years on Facebook.
Facebook marketplace, free to advertise, where most cheap cars go these days.
Sold my sons 2009 mini to the first person that turned up with a queue of 25 others wanting to view. You’ll get a few chancers lowballing offers on email, just sift them out