I’m in the same boat as you. One of the last of my single friends just got married. Try to keep busy, even if it’s just to help around in the house. Maybe play some games, take on some hobbies? Writing, reading, an instrument–or be a nerd like me and work on math problems? Trivia quizzes. I used to do some needlepoint. It’s relaxing (and no, it’s not just for old women!)
One thing I started recently is learning a sefer. Right now, I’m learning Yehoshua. After that, I plan to learn shoftim, and move on to Shmuel and Melachim. I also plan to learn the parsha every week. You can say Tehilim, maybe learn some halachos from the kitzur. Listen to shiurim online (wish I had more time for that). Ummm what else? Maybe pick a random topic and research it online? I’m sure you can come up with things 🙂