This is a subject I've touched on before, but here's a friendly reminder...
If you have a new album and it's not selling, it may very well be that people don't know it exists. Believe it or not, 84% of people don't know when their favorite artists release new albums.
Automated systems from music stores like Amazon and iTunes, which look at purchasing patterns and let people know about things that might be interested in, can help, but don't count on them to do all the work for you. Nobody is going to care about letting people know you have a new album available more than you do, so if you want to make sure that happens, you need to either do it yourself or hire somebody to do it for you; it won't happen automatically...at least not in the way you want it to.
Don't be shy about promoting yourself or think "my fans are different." Your fans are not different.
Let people know about your new release. Do it now.