Trying to persuade people to leave their cars at home is going to require a major rethink.
It is, but I think it's a rethink worth having. I don't know if we still have one, but there used to be a loneliness tsar, and I have no reason to suppose that loneliness has declined. There is certainly a problem with mental health, and loneliness can lead to depression and anxiety.
Freedom of movement is critical for employment - both so that people can get to work, and so that customers can get to businesses to buy goods and services. Without it, there are too many restrictions on what people can buy and use, which obviously impacts on the viability of businesses.
There is also the pollution issue, and IMO charging people to move around is an awful way to deal with it. It basically says that you can travel (and pollute) if you have money, but if not you have to stay put. So pollution is less important than money, which is ridiculous.
Also, the more cars on the road, the more congestion there is, so the harder it is to get around for those who need to. If we had better public transport (cheap/free, clean, regular, reliable and safe) people making non-essential journeys (eg shoppers) and commuters could free up the roads for those who need to be in a car rather than on a bus/train.