We all make the mistake of looking at life through a very additive lens. This is another way of saying that our sense of moving forward is often rooted in ONLY adding more to what we already have.
This isn't always effective though. Oftentimes, in order to do add something new, you may need to do away with something old, much like furnishing any space that you value. This can be a little uncomfortable especially when you've anchored your sense of self to an old skill, idea or habit.
But as Nietsche wisely warned us: "People don't have ideas. Ideas have people."
Remember to unlearn some things that you have learned!