What Is Beyond Our Solar System?

i'm fascinated about interinterstellar space. We have astronomical evidence of what is beyond the solar system. The nearest star is proxima centary. Of the voyage spacecraft are still communicating with earth, but i believe that by 20 25, communications will cease because the power generating system will fail. So these other two er and i believe, even the pioneer probes are in now, in interstellar space. Why don't we pursue more such missions? And what lies beyond our solar system?