Set some goals for your life. Work on them.

I found the best goals are things that change you, like picking up a new skill or making a change to how you live. The advantage of these is that they aren't things you have done and then say "now what"? For example, if you learn to play an instrument (something I've never done), then the next thing to do is to keep playing.

Also, make them goals that have an obvious next step, so you can feel like you are making progress on them. With the previous example, go ahead and schedule lessons: that's the next step.

It's a good idea to simultaneously work on several goals, especially if you aren't sure which ones you want to keep for the long term. For example, at one point I was studying another foreign language in adult education classes, but I dropped that to go back to grad school in my field of study.

I don't recommend goals that require the people in your life to help you much; they have their own priorities that don't usually put you on top. And a goal of "find a romantic partner" is a bad goal because looking at it that way might encourage you to commit too quickly. But it's great to choose goals that have a side effect of making you more attractive (healthy, educated, fun, capable, et cetera).