Hi!
There are actually a lot of online courses to choose from. It really depends on what your interests are. It's also good to be able to help people. People who needs guidance in their lives. I could suggest you take up a home-based course to become a counselor. I've heard this from a friend
One of The Best Counsellor Courses available but there are many others that you can Google of course.
Anyway, this would be perfect for a busy person like you. You can study this course anytime you want and during any free time you have.
Remember, choose wisely so there'll be no regrets!