Yes it can be said you should do well if you are catering for a Jewish women only market. To do well in the real world would no doubt require great marketing skills coupled with the most important combination of a good voice and exciting repertoire.
I love listening to women’s voices and as a frum woman am always on the lookout for new and different people to follow.
I am a big fan of Yasmin Levy and I know many other frum women from very varied backgrounds who buy her music.