Microsoft admits 8GB RAM is fine for Windows 11, after years of pushing 16GB as the baseline
(www.windowslatest.com)
That is not how this works. The system isn't using all that, I can guarantee that. Even launching a terminal (or any app) as hidden will not make it and its usage appear in taskmgr - I once unknowingly managed to exhaust my 64GB by launching hundreds of terminal sessions withoutever killing them. Try something like sysinternals process manager to see what's actually going on.