I sold my 2016 4x4 TA on Autotrader within 2 days of listing it, and not because it was cheap. Got a decent price for it, way more than the Fiat dealer was offering as a PX on a new Cross with Fiat Affinity discount as a Fiat Motor Club member.
As a 4x4 city car it's in a nice market that it shares only with the Suzuki Ignis. So there aren't huge numbers looking for them, but potential buyers are really keen and will travel a long way for a good one - my buyer lived 300 miles away, and cadged a lift with a delivery driver. I had 3 enquiries - one was just a dealer looking to get it cheap. 2nd seemed serious, but within an hour the 3rd enquiry came in, and he paid a deposit immediately, subject to the viewing matching the photos and spec.
I also put it on GumTree as that was free, and focuses more on local - no response from them.
If yours has the Winter Pack then it's a big plus, make sure it's clear in the ad wording.