Cramming more people here is not the solution. Making it more appealing to live elsewhere in lower density and lower cost regions of our vast country is.
Consider the following: a government incentive to business to subsidize or lower taxation for people who can work remotely.
If I’m a web designer or IT expert have the government subsidize my employment or lower my taxation for living outside of a major metropolis. Work out of the interior somewhere in a town of <50,000 people. But to get the subsidy the employer must commit to maintain the hire for a minimum of 5 years.