Give men a manly job they strive for and deserve: Army service. Expand armed forces and military industry, paid for by increased taxes, to absorb all young men who can find neither work nor spouse. And just go on conquest, to expand the limits of the free world.

Because birthrates do not really depend on those men since they can't marry anyway, nor is the economy, they are pretty much expendable and Soviet style loss rate will be acceptable. With that tolerance to losses, America can achieve massive victories.

Quality of the future generation will also improve since women will all have kids - alone - from a small pool of high quality men (those who can get laid on Tinder).

Once the military men retire from service, they can be given property and positions of power in the new lands they take, to create a core of newly forming elites, which will be fair given their sacrifice and will give them equitable, deserved station in life.