Total GDP is not a measure of the wealthiness of a country.
You need to look at the GNI per capita.
Government debt is not a meaningless concept because it is borrowed money that we pay interest on to service the debts. The interest on U.K. government debt is £110bn per year, or 10% of total government revenues. This is almost as much as the entire cost of the NHS. That’s not meaningless, government debt is a serious business.
No government can just print more money without there being serious consequences to revenues, the budget for civil services, the overall economy as currency loses value internationally and to the country’s credit rating. It often makes everyone more poor.
We can increase taxes. That tends to make everyone more poor as governments tend to protect the income of the rich & business and go after the middle and lower income brackets. Especially our government- when you hear them talk about the way to prosperity is to stimulate business, work people harder, cut benefits you know they are raising taxes on those the least able to pay more.
“Printing more money” (quantitative easing) would cause accommodation costs to go up, not down, as that deflates the value of the currency. The only way to reduce accommodation costs which I am reading as housing costs would be to increase the supply of housing because the costs are caused by high demand and low supply, something which would take decades to address ergo can’t be fixed tomorrow as you thought. You can’t stop the transfer of wealth overseas by adding in land value tax because most of the wealth made and invested in offshore tax shelters is not linked to land. Land value tax would simply be translated into higher taxes for landlords and we know the disaster that has been as the U.K. has been increasing income taxes on landlords such that they are selling up and rent costs are soaring, making the housing crisis worse.
Nothing ever changed because people sat making snarky comments about ivory towers. I agree with this, unfortunately there are no short term solutions to the current state of things. A succession of poor governments both Labour and Tory have hollowed out the U.K.