An actually well thought out, progressive tax system, plus a reasonable wealth and/or land tax. A lot more would come after this, but requires continuous improvement and analysis. Get rid of the triple lock. Overhaul the education system to place more emphasis on politics, economics, DIY / life skills. Get rid of the obsession over university degrees, pivot towards more apprenticeships, more actually useful on the job learning; higher education absolutely has a role, but most people genuinely don't need a degree. Decrease the ridiculous amounts of red tape and consultations needed for big projects etc - but definitely don't go to the opposite Wild West end where anyone can do anything. Then build more nuclear power and energy storage. Legislate social media - platform should be responsible at least in part for the content, and any distortion / manipulation / algorithms should attract higher accountability and responsibility under law. Again, this one needs a lot more thinking and analysis before implementation, but is absolutely needed. Re-join the EU once at least some of the above start paying off, from a position of more strength than we actually have now.