Ebay and Amazon - I make good money with both, more with Ebay, but I don't really work hard at it and except for antiques, don't really hunt for stuff to sell. I know a couple who have lived off the grid their whole lives, never have jobs and make their money from buying low and selling high at flea markets and now, ebay.
But they really work hard at it. Its their whole lives.
I don't think you have to go that far but I read a book some years back, called something like "The 4 hour work day" and that's what I've done for years now. Yes, we are both retired and have incomes from Social Security and investments but every retired person faces the fear that they will out last their money so we keep working. Also, we like to travel but we don't like debt. So, we travel so we can pay cash for whatever we want.
But, if I were your age TK and wanted to make big bucks, I'd buy real estate. Don't say,
"I can't". Yes you can.You can always buy without a down payment - believe me, its not that hard. Then, rent it, flip it whatever it is you want to do. I did it in Tucson and made a bundle and if I needed to make big money now, I could do it again. Yes, that's right. I was one of those who bought real estate with no money. Smartest thing I ever did.
Make no mistake - its killer hard work. But the pay off is huge. Like everything else, its whatever you make it.