What changed? It got harder to build because the government empowered NIMBYISM and nonsense “environmental impact” rules (hint: nobody actually cares about the endangered burrowing owls, they just don’t want affordable housing near their homes).
The affordability crisis was caused by government.
Any solution that piles even more government on top of the current government-caused problem is a no go — especially pie-in-the-sky solutions like land value taxes.
The only solution is to make it easier to build. But that's politically painful so it’s not going to happen. We even see places like California making it more expensive to build by requiring solar panels on new homes, in order to virtue signal about climate change without actually solving anything. So, invest in expensive areas, they are only going to get more expensive!