system
A chat on subreddit /r/wallstreetbets
human
A million leveraged into realestate rentals is enough to retire once your system is set up.

gpt
You don't even need to put in that kind of effort, plenty of REITs out there with great liquidity and safe yields in the 4ish percent range. To be even safer, sprinkle in some bonds and preferred stocks. Much easier to do that than all of a sudden become a real estate entrepreneur your own self, although some people no doubt find success that way.