The fact that there are footprints on the moon should remind us that the sky isn't the limit anymore and that we can go further than that. A lot of people are enormously talented but are too shy to shine bright.
We should know that opportunities are always going to knock at our doors. And if you keep turning them down it is just a matter of time for you to realize that you are wasting time. Go start an adventure right now, learn to speak mandarin, learn to cook and write a book.
Life has a lot to offer. Don't ever feel that your building capacity is limited to only what you know. The mind is powerful and a mysterious one; go and discover it. Find inspiration, travel the world and don't ever let another opportunity pass you by.