Have a look at what they are generally advertised for, then put it on the market for at least 10% less, should go quickly.
A dealer will likely give you at least 20% less than this, so even selling it for less than you wnat privately will still put you way ahead of the price a dealer will give you.
It is a crap time to be selling cars though, at least an XTrail is typical so shouldn't be too hard to sell.
Try your local gumtree.com.au too, seems to be much better for off loading cheap stuff but given the adverts are free it is worth a shot.