Building small internet things.
I turned an unused parking spot near a hospital into steady monthly income by listing it on a peer-to-peer parking marketplace.
A single-purpose SMS reminder tool sold directly to dentists. No sales team, no enterprise pricing — just $49/month and a working product.
Instead of chasing every program on HackerOne, I picked one large target and learned it end-to-end.
Zapier, Make and a few custom scripts. Retainers of $1.5-3k/month per firm.
Rank three plumbers in three cities and never take another cold call.