There's lots of planning policy stuff to do as well. For example STOP BUILDING OUT OF TOWN SUPERMARKETS. These are entirely designed around convenience for car owners. They actively encourage car use in rural areas. There's no good using a token bus service to claim that they serve others. Have planning policy which encourages more local shops, just like good planning in urban areas encourages. Have shops co-located with public transport hubs and networks.
Also on planning policy - I would like to see a bit more emphasis on transport availability when deciding on planning permission for new housing. So discouraging scattered development, and encouraging new houses to be built close to transport routes or ideally within walking distance to a local centre.
A quite small village can sustain several shops/services if their customers aren't habitually driving miles away instead. Having active villages like this isn't just good from a transport point of view - it's good for community cohesion and all that stuff too.
As I mentioned the other post about country lanes, I think there should be a review of rural speed limits too. One reason is to increase safety for pedestrians (just like in urban areas) and encourage people to walk to local centres. It shouldn't be the case that it's often actually harder to walk somewhere in the countryside than it is in a city. If as a side effect this increases certain journey times, then that isn't necessarily a bad thing, and might also help tip the balance in favour of public transport alternatives. In most rural areas there's a cake-and-eat-it attitude to travel times where people want to live somewhere quiet and remote and at the same time want to be able to get to places as quickly as possible. If you want to get to town quickly, live closer to town. There's a constant pressure to make roads faster and faster and I find it nonsensical. A lot of old arguments about increasing the economic fortunes of rural areas don't apply any more - we mostly no longer have a "working" countryside in the way we used to. Increasing road connectivity is not letting poverty stricken rural basket makers and apple growers get their products to town - it's now about letting remote-working accountants get their amazon order delivered more quickly, or shortening the commute of people who work in town but want to live somewhere with a big garden and less air pollution. I exaggerate of course but some of these arguments need to be called out and we need to be realistic about what the countryside actually is now.