Your message is generated by CleanMyMac, correct?...
Are you actually having a problem with anything except CleanMyMac?
What does CleanMyMac support say about that?
(Maybe they will offer to send you the "latest beta" of CMM?)
But, seriously, I would like to point the "finger of shame" at a utility like CleanMyMac, but that doesn't really address your question.
Truth is, there's still some issues with Monterey, and one of those is problems with memory leaks.
I am hopeful that an update to the system will help, or completely eliminate the memory problems in Monterey.
Could be fixed in 12.3, or 12.4
You COULD "quit any applications that you are not using", check for better use after the next update to Monterey. Regardless of what I read sometimes on these forums, Apple does occasionally fix stuff...