This is something your doctor will know way more than me, mostly because I'm still in med school, and they know your history.
It would be irresponsible for me to recommend a different med because I don't know your history, what you've tried, or other considerations your doctor has had to put you on invega vs something else.
As a general rule of thumb, the positive symptoms are much easier to treat than the negative. In some ways, the negative symptoms of schizophrenia are considered somewhat treatment resistant. There are some studies showing adding an antidepressant like mirtazapine might help, but again that's something that your doctor would know if it would be helpful or appropriate for you specifically.
And as another rule of thumb, all of the meds in the same class as invega are pretty minimal about prolactin, except for risperidone. But again, everybody's different and can respond differently, so that can be hard to predict sometimes.
Okay, thanks. ---
don't worry, it ain't about me cuz i don't let misfortune bend me all outta shape