Build. More. Homes.
We used to have enough, and then in the late 70s, early 80s they decided that if they didn't build enough, then they could make housing scarce and therefore more valuable. A big long-con, 40 years in the making.
Housebuilders would make more profit per home. Homeowners would have more wealth (even if they can't access it). Inheritance taxes could take more of a bite. Landlords could charge more. Retirements could be funded entirely by buying 2-3 houses and renting them out, and then cash in later on the full value of those homes when they'd gone up by double the interest rates.
They don't have to be amazing homes. They don't need an acre of land to sit on. They don't need three bedrooms. Kitchen, bedroom, bathroom, living room. Affordable on a quarter of a single person's minimum wage income.