After I quit drinking I felt lost about what to do with my time. So I started writing out what I was going to do for the day in my planner. I focus on eating 3 healthy meals a day plus snacks, getting some exercise (even 10 minutes of stretching/yoga and a few pushups if nothing else, which might work well for you when you don't want to go out in the cold. You also might consider some free weights or some other sort of exercise you can do at home.), time on SR and to kind of check in with myself on how I'm doing, chores, work, reading. I play drums so that goes on my schedule, too.
Then if I'm feeling 'blah', I try to start in on one of the things listed in my planner for the day and try to focus on doing things.