The only way to consistently grow your art business is to stop relying on 3rd parties (galleries, marketplaces, etc.) to sell your art. When you own your distribution, when you own your customer list, you are in control of your business and you can actively grow your business. When you rely on the algorithms of marketplace websites, and when you rely on galleries to sell your art, you are in control of nothing and your income will be unpredictable and unrepeatable.