What's the best way of selling a one year old car, other than trading it in?

What do you think is the best way of selling a one year old car, other than trading it in?

I bought a Fiat 500C for £9995 in April and now they'll only give me £7000 to trade it in - what do I do?

I bought a 2014 Fiat 500C in April for £9995, but soon realised the little boot opening is not good enough for me. I enquired about exchanging it for hatchback version but only got offered £7000 for mine,...