The way that many artists go about their art business is a cause that stagnant results. Sometimes, artists need to try a different approach to their art.
This can mean many things, but one example is to change the message behind your art. Giving it a different crowd can add new appreciation to what you are doing. It can also mean to try a different approach within yourself. Figure out what motivates you as an artist and feed from that energy. Momentum is a very powerful force. It can break a limb or it can fulfill a destiny.
Above all else persistence and hard work are the key. Talent only gets you so far.