https://rationalwiki.org/wiki/Carl_Jung

To be more specific, Jung's psychology has been characterized as "unscientific" on the following grounds:

• that some Jungian concepts, such as archetypes and synchronicity, cannot be proven by the scientific method
• that Jung subscribed to a nineteenth-century notion of evolution that has since been discredited
• that Jung's valuation of the mental functions of feeling and intuition on the same level as thinking weakens the attitude of rational objectivity that is essential in scientific research
• that Jung's interest in occult traditions, including the pre-scientific European past (third-century Gnosticism and medieval alchemy) and contemporary Asian cultures (Taoism and Tibetan Buddhism) amounts to a glorification of mysticism and irrationality
• that Jung's clinical specialization in the treatment of schizophrenia and his own brush with psychosis made him an untrustworthy guide to "ordinary" reality

https://www.europeanmedical.info/cognitive-therapy/the-unscientific-nature-of-jungs-psychology.html