Physical art. (Not digital.) What sells? What is truly appreciated?

I think the answer depends on how you define art.

Like, the artist in me wants to have a discussion about the appeal of abstraction versus impressionism, and whether you should compromise your artistic vision for the sake of commercial success.

The pessimist in me says that the most popular physical art is probably Pokemon trading cards and other merch.

"Physical Art" is a pretty broad category because there's still a million mediums you can choose from. Would making prints of digital art count as physical art? That might be a question for the philosophers.

Anyway, if you're looking to break into the scene then you should probably visit some craft fairs / galleries / tourist traps and see what they're selling. Talk to the artists in the medium you want to explore.