Where does motivation come from? How do I motivate myself?

So, I recently graduated college... about a month ago. I've had this problem for a while where I constantly feel tired, low energy, out of it, apathetic, unmotivated, etc. I've always kind of thought of it to be a result of my years growing up, where I had little confidence, high anxiety, some depression, etc. Now that I've learned how to deal with those things, I just am more apathetic in general. Is there a way to easily deal with this? Thanks.
Where does motivation come from? How do I motivate myself?
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