I struggle with gaming addiction during the winter months. Less outside activities to do, so I become slightly reclusive.
Reddit's /r/cheaphobbies is a great place to explore some different stuff to do.
Also, I always make a list of things that I want to get done. These can be self-improvement things, stuff around the house, or necessities. Hang it about your computer and it'll likely motivate you to doing stuff, because its constant over your head, literally.