Just my modest investment portfolio, and credit card rewards (not technically income, per se, but it's money the card companies give me just for being cool and

Just my modest investment portfolio, and credit card rewards (not technically income, per se, but it's money the card companies give me just for being cool and using their cards, so I'm counting it). I'm looking around for some slightly less passive ways of making a modest income that don't turn the slider all the way to "start and run a business."