Urban Planning
Urban Planning is a great field that acts as a Middle ground between design and policy, it is approachable and has a tangible effect on all of us and how we live. If you care about how are cities develop, it's a great field to get into. It's a new field meaning that there is a low barrier to entry, you can enter it from many degrees such as Urban Planning/Studies but also Architecture, Political Science, Sociology and others. So yeah if you want to do something that makes a real change for the better, consider Urban Planning as a field.
If you have ever considered Architecture but felt like the scale of a single building was too limited or wanted to work in local policy that has an effect on people’s lives without being a politician, it’s a great option