The short answer is: I don’t do much else!
Another short, but hopefully more helpful answer: you can’t find time, you make time.
But seriously, I don’t really do much else. I don’t watch TV and I don’t play video games (or, at least, not nearly as much as I used to.) When I’m not at the day job and while my children are asleep, I write and I draw. I work.
And that’s what I mean by making time. If this is what you really want to do — what you need to do — you make time. Something else has to give. Maybe you don’t want to give up watching your favorite shows or perusing your favorite memes on reddit, and that’s fine! I’m not suggesting you give up all of your favorite past-times and devote yourself entirely and exclusively to your craft, but I am suggesting that maybe you take a look at how you spend your time on a daily basis. Maybe, as a random example, you spend some time each night checking Facebook. Let’s say two hours of Liking pictures of newborns and arguing with distant reletives. What if you were to limit yourself to an hour-and-a-half instead, and do a little drawing or writing with that free half hour you just made? Anything at all, it doesn’t have to be a masterpiece. In fact, go in knowing that it won’t be. And that’s okay! Plenty of my drawings fail to meet my unrealistically high expectations and never see the light of day, but it’s never a waste of time.
I know this is all easier said than done. Time management and self-discipline don’t come easy and take a while to build, but this is how you do it. You start slow. Don’t be too hard on yourself by trying to do too much too fast. Try and do at least a little each day, even when you’re not feeling especially creative. Making that initial effort, however small, makes all the difference.
And let me tell you, that knowledge that at the end of the day, you made something that didn’t exist before? That feels pretty amazing.