Long ago, many artists survived because of wealthy patrons. Bring in a system that allows businesses to take the place of those patrons.
Bring in tax incentives that encourage (big) businesses to sponsor individual artists.
Businesses and artists can sign individual contracts that covers everything from the payment to the artist, advertising at exhibitions/in books/at concerts/whatever and what the artist has to pay back to the patron (eg- 100% of all royalties to the value of the contract then 50% after for the life of the contract).
There could be tax incentives like making the contract amount plus any profits above that amount 100% tax deductable plus all so the companies could conceivably make money and they would be supporting artists which enriches the culture and brings money and positive attention to the nation.