Why aren’t people building as many new houses as there’s clearly demand? Numerous factors: greenbelt laws, height restrictions, “Right to light”, NIMBYism, etc. I don’t believe I’ve seen either major political party advance a policy of making it easier to build new houses - or tall tower blocks (the nice kind, not the 1960s council flag blocks), I suspect because it would result in immediate uproar from the Daily Mail-reading types who can’t bear to see their house-values fall (I think Sunday Observer types would be a bit miffed too, if not about house prices then certainly the ecological impact: having lived in multiple countries in my life I noticed the “rural-rights” types that advocate preserving hedgerows and rambling access have a considerably larger influence in UK politics compared to other countries).
A collectivist solution would be to coordinate with other citizens to abolish the building/zoning restrictions and savings devaluation enforced by local and national governments, that cause the constant real estate price inflation in the first place.
The first step is to educate enough people around this issue, so that some opportunistic countries/cities can become competitive at attracting residents using fairer policies as a differentiator.