Becoming handy helps a lot
Personal woodworking projects, fixing stuff around the house etc. is much better than either doing nothing or using all that time sitting around in front of your computer or phone.
It keeps your mind off of anxiety inducing thoughts, it's enjoyable, kills boredom etc. And once you're good at it you can use the skills to make stuff for yourself(or even find a new job). Reading is cool but IMO it's not the best use of all your free time, especially since you're on the computer and it's too easy and tempting to use the internet and get wrapped up for hours of wasting time.
Just some advice I wanted to share, I don't think I've seen it talked about on this site. It doesn't matter how small the project is, just working on something/anything has so many benefits for SAD people.