Wonder is what remains when knowledge increases without curiosity decreasing.

It is possible to learn a great deal and stop wondering, and it is possible to learn a great deal and wonder more. The difference is whether knowledge is being used to close questions or to open them. Expertise that leaves someone incurious has usually been acquired as a defense, a way of no longer having to be uncertain in public.

Check how you hold what you know. When you learn something, does it end the topic for you or send you somewhere further in. If everything you know has been settled, it may be worth going back to one of those subjects and asking a question you would not want to be asked.