In your original post, you indicate that you have two sets of substantial funds, one in the stock market and one in cash due to the recent sale of a business.
Judging by the words chosen, I would assume the two sets of funds are equal?
When in doubt, look to those who have achieved more than you: Buffet, Gates, Wal-Mart heirs (b/c somehow they know more than welfare recipients), Bezos, etc. What % of their fortune is in the stock market vs. cash? Can you achieve a similar asset allocation?
In sum, the stock market has been and will always be the best wealth creator available to North Americans and those who can access their stock markets. The best 'post-FIRE business you can run with minimal effort' is to manage your Vanguard total index fund. There is no reason to 'buy yourself a headache' so that you can putter around. Invest in Vanguard and pursue your hobbies. If you have no hobbies, become a foster parent as there is a serious over-supply of kids who need help. Or volunteer at the non-profit of your choice, mentor young kids who don't have the advantages you did so that they can grow and follow in your footsteps, ANYTHING but buy yourself a headache billed as 'minimal effort' (think about it; if it was minimal effort and profitable why would anyone sell, or sell at a reasonable price?)