"Multiple Streams of Income" What does that really mean? It doesn't mean having a second job, I don't think. What it means to me is maybe having your base job plus developing other ways to generate income.
It can mean having some chickens in the backyard that lay enough eggs so you can sell a few dozen a week. It can mean raising chicks, quails, or rabbits to sell as pets. It can mean developing a craft idea that can be marketed at craft shows or flea markets. It can even mean teaching classes to individuals or small groups of people in a field where you are excellent.
In fact, it can mean doing more than one of the above, or finding your own multiple streams of income. For instance, I can sell enough eggs to cover the chicken feed, though nothing more. However, that's just fine since it saves money that would come out of my regular income. From time to time, I can write paid blog posts. That helps cover my internet and phone expenses. I can even sell items on eBay to add to my income.
What can you do to supplement your income? Perhaps it's only seasonal, as those who create Christmas decorations to sell. Perhaps it's something you can do year 'round to pull in a few extra dollars a month.