A lot could be achieved by redistribution, I think. The UK is a more unequal society than most. And withdrawing immediately from all wars.
As for being on the leave side, I’m not British and don’t live in the UK, so I don’t have that much of a right to an opinion. HOWEVER, I’m quite sceptical of the EU as a project. And my main disagreement with you is also, I think, that I think Britain’s being in or out of the EU will not make much of a difference, financially.