Expertise does involve supplying answers, eventually, but mainly expertise is about asking the right questions, first, and then offering a few answers after the truth surfaces.
Expertise is primarily about curiosity, and curiosity requires many, many questions. And each question you ask narrows the field of enquiry until the answer just lands on your lap: plop.
An expert brings all the tools they’ll need in a well-used toolbox, but that collection of tools doesn’t mean a lot, because the key to solving problems is to know which tools to use, in which order, and those tools are often nothing more than really well-articulated questions.