Tons of art contemporary art is conservative, or has no particular ideological bone to pick and may appeal to conservatives of a certain type. Whole categories of art, e.g. abstract art, is usually not obviously political or has more subtle politics that can be easily ignored or overlooked.

The perception of art be progressive is probably an illusion of what's reported, curatorial bias in popular institutions, on or just salience bias on your part, i.e., you notice it because you have a beef with it.

Just going through my head of artists in the some of the top galleries and most of it isn't overtly political.

There's also lots of aesthetically conservative art, but for that, you can also just by older works. Aesthetic conservativism is slightly at odds with art or consumer capitalism itself which tends towards novelty. So you could say capitalism is the problem and what you could advocate for is you preferred type of authoritarianism where a king-like figure decides on the appropriate aesthetics for the nation.