Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !witchymemes@lemmy.world
Right now the list reads plural, plural, and singular. Parallelism states that all words in a list should have the same form. So they should all be plural, or all singular.
While that is true, it also means various types of alterations in consciousness and paradigm shifts, but there is really only one type of existential crisis.
Not really. A midlife crisis and a psychotic episode could both be called existential crises. I don't think there's a hard definition to it like you seem to be asserting.