If you think the #housingcrisis is manly about supply (as I've suggested npub1yepk8n2nca8e5md0zclgc8kn8egf0kg7al0w3q3ruh7rfmyplvfq3wrqsz (npub1yep…rqsz) its more than just that), you will be interested to note that the key constraint on the building of dwellings was actually the end of council house building.
So if you really want to see a rise in the numbers of homes built you'll be wanting to support the (re)expansion of housebuilding in the public sector...
Chart from a detailed article on #wikipedia - https://en.wikipedia.org/wiki/Public_housing_in_the_United_Kingdom