If you consider what the perfectionism is the effect of, it's easier to unwind than just saying, "oh, you're in a hole, you should stop being in a hole."

Describing anything as an 'ism' is a thought terminating judgment of it, and not a meaningful abstraction for it that yields information about what it might be caused by.

This article might help your understanding as it talks about what concrete thinking is and how to recognize it: https://www.psychologytoday.com/us/blog/theory-and-psychopat...