Hello Jay,
In my, honest, opinion, to fill the void and emptiness of your day you should think of something not entirely boring and also not something that is either fast achieved or temporary.
I strive for education. During the years of Middle school, I would fill the gap with the schools sport teams, Basketball and Volleyball. Before doing so, I made sure to seek aid from the nearby library with my homework and continue French classes with one of the librarians (who taught me it for free by selecting books and helping me read them. She completed french courses in college but she did not know what to teach, so reading books seemed educational).
During High school, I joined multiple clubs and participated in many internships outside of the school, offering community service. I joined the communities Boys & Girls bluc inc., the Library, one of the Middle schools (by guiding students out of streets, helping enroll into school sports and enlisting for tutoring even if unnecessary). By my junior year I was very glad to be an intern for one of the law offices in my city, and, in some cases, was able to participate in some law processes (nothing huge, mostly immigration and divorce). Senior year I fully dedicated myself to help elderly's. It was rather enjoyable helping them cope with some of their emptiness (some of their children deceased or do not bother to show up). I sometimes pass by to give them a warm hello, and am now considered the grandson of most of them. On the spare time I was handed (I know right), I attended a very private gym ($30.00 a month, just so that I wouldn't have to see some people).
You have to know who you are before you decide on what to fill your void. It's easy to experiment, but it's hard to stop experimenting. Once that smell is really strong and alluring, stick with it. It is, or should be, what you are able to accomplish best, after educating yourself of course.
A wise man, yes from the elderly home, told me that "If some doors don't open, make new ones because the world isn't handed to you, it is left with battles to be conquered."