imimportance 

To not have importance, to have irrelevancy.

alt: imimportant
s: unimportant

Crypto Currency is falling into a void of imimportance.

imimportance by Merriam Webster 2 November 3, 2023

unwarranted self-importance 

A serious form of narcissism. To act as if one is an important person without actually doing anything worthwhile to prove it, thus making one look like a complete tool.

Sometimes abbreviated as USI.

Idiot: Hey guys! I just put up all these sweet pictures of myself on Facebook, and I've got this vlog that you've gotta check out. If you don't, you're clearly some kind of lesser being, 'cause everyone loves me for no reason!

Smart Person: Sounds like unwarranted self-importance to me.

unwarranted self-importance by IrishBarbarian January 23, 2011

Person of Importance 

A key person whose actions and opinions influence the events around them.

Ever since Megan's got the job, she's become a Person of Importance.

Person of Importance by the_surveiller May 16, 2013

Self-importance 

An exaggerated sense of one’s own value or importance. -Emeasoba George

Self-Importance is synonymous with arrogance.

Self-importance by Emeasoba George June 9, 2018

rank-of-importance 

Arrangement of several issues, tools, people, depending on what share of usefulness each will take if prioritized on a particular period of time.

Let me use the rank-of-importance to sort out old customer orders before the new ones arrive.

rank-of-importance by Walkoment October 31, 2020