How do you reignite the fire of passion?

There was once a time where I enjoyed many things. I strived to improve many skills of mine. But as the years went on and I got older, I found myself caring less and less about these things.

The things I used to truly enjoy just became... mediocre at best. Things that were once habit and enjoyment... came to gather dust in a corner.

It bothers me that I can't find that passion I had to constantly improve myself that I had eleven or so years ago.

Have any of you ever had this and managed to fix it?
How do you reignite the fire of passion?
How do you reignite the fire of passion?
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