The best replacement for existentialism is nihilism.

The best alternatives to existentialism are rated as following:
★★★★★  nihilism
★★★★  humanism
★★★  absurdism
★★  transcendentalism
★★  essentialism
★  postmodernism
★  naturalism
★  objectivism
★  pragmatism
★  determinism
★  idealism
★  fatalism
★  marxism
★  rationalism
  ontology
  phenomenology
  empiricism
  perennialism
  romanticism
  metaphysics

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Speaking about existentialism, one probably shouldn't forget about sartre.

Other search terms related to existentialism and their ratings are:
★★★★★ sartre
★★★ soren kierkegaard
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