Ask HN: Single founder needs your help

Ugh, I'm living in my vehicle on the SF peninsula but writers'-blocking on startup ideas and in the market to execute quickly.

Criteria:

- low overhead PoC

- scalable

- defensible

- somewhat novel

- full-stack engineering is covered (yo)

- more necessity than discretionary (downturn survivable)

Any pointers, suggestions or crowd wisdom would be greatly appreciated because I can take it from there.