As recommended by Richard Reeves I'd red-shirt men (hold them back a year) in education so they were developmentally in-phase with academia and more likely to succeed, thus giving women more successful men to look across and upward at.
If evidence bore out that men did better with hands-on learning I'd also perhaps do more to bifurcate education for men in that direction, again for reasons stated above.
Increased incentivization for male children to have either fathers, uncles, or good male mentors of some type around to give them a point of reference on what it looks like to turn out well as a male.
I'd also do my level best to figure out one of the following and implement it:
a) Figure out why social capital and meeting places have been on such a deep decline (the whole 'Bowling Alone' thing) and try to re-incentivize formation of stable social capital, this way people could not only do more interesting things in groups but wouldn't be as stuck to Tinder and other dating apps.
b) For people who really like dating apps over meeting people in person I'd build a new dating app that encourages positive interaction, open forum rather than walled, and structurally penalizes spamming (ie. the guys who'd count 3,894,241 women on the service and bulkmail requests to all of them in one evening). It would be a bit like the Instagram dating scene but a site specifically for dating - although if straight guys or girls made great friendships there too that's cool as well.
Pretty much anything I could do to reconstitute the health of dating, mating, and family world by better satisfying the principles of Darwinian game theory I'd do it.
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“Love takes off the masks that we fear we cannot live without and know we cannot live within. I use the word "love" here not merely in the personal sense but as a state of being, or a state of grace - not in the infantile American sense of being made happy but in the tough and universal sense of quest and daring and growth.” - James Baldwin