Many registrars let you buy a domain and set up dynamic DNS for it within their system so you can own a domain and get dyndns on it.
Otherwise you could accomplish it with a VPS but you'd only need the smallest one available because it would just need to run nginx to forward to your home ip (and a small tool to update that IP when it changes). So you could probably get something for less than $5/mo.
Finding pockets of self sufficiency, or at least ways to prevent falling down to the bottom.
Universal basic income helps this by making sure everyone has at least enough to live on.
Homesteading and community gardens help this by making sure you at least have some basic amount of food available to you.
Building walkable cities helps.this by allowing you to avoid or reduce the expenses of a car.
Building resilient cities that leverage adaptive reuse help this by making it cheaper to start new small community businesses that keep money local.
The solutions aren't in the system of money we choose, it's in building small sustainable ways to provide for basic needs, even in a small way.