I love having multiple side hustles. I have never depended on my primary income as my solitary income and I think that has been my saving grace for money management.
My side hustles have included: tutoring, editing, freelancing, and research writing.
The key to a side hustle is that is has to be something that you are passionate about because it is going take dedication to be consistent. After already working eight hours you are going to have get that cup of coffee and mentally prepare for your side hustle.
Sooner than you think it will become second nature and working ten hours a day will fee normal, as long as you take care of yourself, are extremely organized and practice good self-care.