There are both groups. Some people are busy now and will remain busy. Others have no hobbies, and will continue to have none.

Which is to say figure out something you can do in your free time so when you have more it can fill that time. Even if it is only a few minutes per week that you can do something. There are a lot of options. Volunteer, build wooden boxes, paint pictures: there are many great options. The point isn't to be productive or useful (though volunteering is and I recommend it for at least some of your free time), it is to have something to do with your time.