I don't know if you have integrated graphics - I don't know anything about your computer. If you do have integrated graphics, it is obviously already disabled in the BIOS (if you have an older computer) or the UEFI (if you have a newer computer) since you are showing 0MB system memory. So much for step A.
Your graphics card already limits the amount of on-card RAM that can be shared with the system. As I explained, the maximum amount of video RAM that is available to be shared with your computer - if the computer needs it - is 8,122GB. So much for step B. If the computer needs less than 8,122GB, it will use less. If it needs more, too bad, since the graphics card reserves 8GB of video RAM for itself.
Not only do these two steps make no sense, neither would prevent your computer from using unnecessary amounts of RAM. If you want to know what's using RAM on your computer, open Task Manager and set is to display the processes in order of the amount of RAM they are using.
In my copy of Windows 11, which doesn't seem to be affected by the memory issue you believe is affecting your copy of Windows 11, the only app I am using at the moment is my browser. Here are the big users of RAM in my computer:
My antivirus app - BitDefender - is the big user, as is File Explorer (which is still called Windows Explorer internally). These are both background processes, as I explained originally. The other big user is my browser, which I am actively using. All other processes use less than 100MB of RAM each, which is a tiny amount. And everything put together is only using 31% of my available RAM, a very reasonable amount which leaves plenty of headroom.