I am a French estate agent selling mainly gites, B&Bs, hamlets and rural property. I used to have lots of buyers from the UK, Scandinavia and the Benelux but now the market is firmly French with a smattering of Belgians and Swiss. You are wasting time and money advertising to the Brits. The pound has fallen 10% but vendors' prices haven't followed suit... so the Brits are waiting to see what happens with Brexit. But even at the best of times British buyers account for less than 0.5% of properties sold in France!!
It may seem obvious, but it's the French who buy property in France.
You can sell it yourself or use an agent: works out much the same in the end cost-wise as advertising on the 'good' sites is often onerous.