Cliche title, and I understand that if someone has the "next" big thing, why would they post it?
This topic is mostly just to open up discussion that many business ideas can be started with minimum liquid investment. I believe too many people feel committed/tied down to their work, has resources available to quit to commit a few years to starting a business.
Why? It can become a form of financial independence.
Feel free to suggest anything, from basic brick mortar with a tech twist, to whatever.
https://www.investor.gov/additional-resources/news-alerts/al...
If so and if you don't want to fully commit, simply register yourself as an accredited investor (= private business angel). Then browse around for early stage and promising startups working on a topic you care about. Go to angel.co or crunchbase. Contact them saying you'd like to invest $10-$15K in seed in exchange for some shares. Repeat until you get a fish. You'll get higher chances of success compared to putting all your eggs in one basket. That's what Tim Ferriss, Chris Sacca, etc. did when they started as investors...
The good part is that you'd become an advisor and would interact weekly/monthly with the co-founders to share your vision, etc.