Depending on your free time, engage in some hobbyist activity.
E.g. subscribe to a foreign language course, where you'll meet some people and gain the additional benefit of learning (at least the basics of) a foreign language (might not be applicable if you are in the USA).
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.