I know HN is not the place for glibness, but literally: just build more homes. Everything else is rearranging deck chairs on the Titanic. Zoning reform is the answer.
The NIMBY mayors of cities such as Mississauga pushed back [2] and the province has effectively backed down.
[1] - https://www.cbc.ca/news/canada/toronto/ontario-doug-ford-hou...
[2] - https://twitter.com/BonnieCrombie/status/1507080290602299392