Our experience of buying two places in France is that you have to work to get a professional estate agent to take you seriously (not a junior sakes rep on commission who will waste your time with pointless suggestions). Quite possibly they have had too much experience of people from UK looking and then not finally buying.
So saying within an hour or two’s drive from St Malo is not very encouraging for someone to put their time in. Failing renting for a while, I would do some research to narrow down your search area and then look for agents specific to that area. Also set out your buying power clearly, ie cash or mortgage, whether it depends on another sale, etc. And if a loan need to get something lined up.
You are more likely to be successful if you approach an agent or notaire in the area (s) you are interested with a clear statement of what kind of buyers you are, and what you are offering. And then your core criteria. Being vague will not inspire confidence.
Also be aware that french estate agents have a very different approach to email. Basically they are much less useful than phone calls. Another difference is that commission rates are higher here, so a few good sales a year can be enough for some agents so they are not as hungry as the UK equivalents who will bite your hand off if you so much as loiter by their window.
Oh, and if your french is not good then deepl or google is your friend, pre-translate everything.