Don't confuse slow-motion multitasking (SMMT) with regular multi-tasking.
SMMT operates on a much larger scale of time - days, weeks and years. You divide up each day or each week in such a way that you devote enough time to all the different projects.
Do all these projects have to generate money for you? Of course not. But it is wise to have objectives and goals for each of them, else you're unlikely to keep track of where you stand. It can make your life incredibly interesting and you'll keep busy without having to force yourself to "work hard"!