Screw it. If I had limitless wealth time to see if ending homelessness is possible with every bit of it I can.
What I want for me is a stable living situation, fun times on a motorcycle, and time to do hobbies without killing myself at work and to travel. My secondaries are those things for the people I care about. Other than the killing myself at work, that sort of thing is obtainable without being a millionaire.
So after that, throwing billions into building affordable housing seems like the plan, combat these scalpers that overdo rent and see if I could beat the countries, then the worlds goal of “stable living situation”. After that… figure out what’s next.
Those that don’t think spiders are cute hasn’t seen a jumping spider wearing a water droplet like a jaunty hat.