My wife has a very demanding career, so really needs her hobbies to let go of the stress. What I do is listen when she's talking about what has her interests. Then if there is anything I can do to facilitate it, it will suddenly materialize. This is not always something expensive or even something material.
Just before COVID the entire family got into playing D&D. Being an artist my wife went bonkers on painting miniatures. So I made sure she had all the paints and brushes she needed. Plus, the dining room, which is actually our "hobby" room, got a lighting upgrade
How bonkers did she get? This bonkers and there are many many more: