Your processor is a ZEN or ZEN1 processor which isn't supported by Windows 11. You must have a ZEN+ or newer processor.
You can upgrade to Windows 11, but in the past, Microsoft has stated that it won't support any computers with Windows Updates on unsupported PCs like yours.
The AMD Ryzen fix for poor performance has already be done by AMD and Microsoft via Windows and BIOS updates.
So when you installed Windows 11 in your laptop it probably already had the L3 Cache fix included and if your BIOS is the latest version it should also already have the fix included unless it is a BIOS Version older than before Windows 11 came out to the public.