Ultimately, nobody has anything to do at all. We just pick up different tasks in order to feel we are doing something, that everyday isn't the same, that we're heading somewhere. To put it in simple words, "that we are doing something worth our time". Once you realize this, you can easily see that even wasting time is just choosing not to do other things that could be considered "worth it" by your own standars. And that's fine as long as it isn't damaging yourself and making you feel worthless because "you aren't doing anything productive".
I don't want to assume things here, so you will have to excuse my vagueness and generality with which I will treat this. The important question here is, are you happy with not having anything to do? Even cleaning your place can make you feel that you've accomplished something. I personally advice to choose something that requieres more effort, though. Languages, origami, drawing, programming. It doesn't have to be necessarily hard. If it requires effort, it will make you feel that you actually progressed, and that's ultimately what differentiates a stagnated existence from a sightly richer inner experience. The idea that we are better than that we were before.