When the energy is there a little more, I'll go on an aimless walk, sometimes four hours away, just to do something and see somewhere a little different, similar to above comments. And when the energy is less but still there there, I'll play an "idle" game or tapping game, to keep at least my fingers busy. And when energy is even lower, often I will just dissociate in front of some TV (I'm bingeing something today for this reason), or sleep as much of the day away as I can. (I don't get much REM sleep at all, so I'm usually tired enough to be able to pass out or zone out).
That's just answering the post title though, and is about the day-to-day passing the time. In the longer run, I've come to recognize and reflect on how many random changes have happened in my life, enough to hold out waiting for what the next might be. Telling that to myself alone doesn't always (or even often) help, but it's something. And something is enough for now.
