One easy fix: wealth tax && unused property/land tax
Best you can do is tax income a lot and capital gains at 30%. Which is exactly what we do in Europe.
These are Swedes. Basically border-line commies from a US viewpoint, they can't even tax the owners of their most famous company.
Literally unconstitutional in the US.
Unused property and land is already taxed through property taxes. Regardless, unused property is an easy scapegoat but not a significant problem (similar to the foreign investor bogeyman) when the real problems are loose monetary policy, speculation, NIMBY zoning, and real supply/demand imbalances.
Where has this been tried and caused brain drain?