How to understand the philosopher Nietzsche's poem To an Unknown God? What does Nietzsche want to convey to us?

A lonely truth seeker, whether the truth is correct or not, has fled to the truth. The lonely hands show Nietzsche's battle alone, and the solemn altar is his affirmation of his authenticity. Unknown God, the philosophical system is creative, unprecedented and unknown to the world. Blasphemy, the world seems subversive, blasphemous and unacceptable, but Nietzsche is convinced of it.