Spend some time teaching someone else a new skill and you will find you know it so much better.
When you teach someone else they have different questions, they may not know where to start, and you have to start from a place where you may not have been for a while..
When you transfer your skills you also gain more in the experience. They will not threaten your job unless they teach more people. But by then you can teach them more..
Join the learning curve.. When you stop learning your dead....