Good Day Jonathanlavender,
I appreciate your time getting back to this thread, since you already tried most of the steps, you can try to perform repair upgrade, it will repair and replace any corrupted system files.
Step 1: Download Media Creation Tool from Microsoft.
https://www.microsoft.com/en-us/software-downlo...
Click “Download Tool Now”
Step 2: Run MediaCreationTool.exe.
Step 3: Choose "Upgrade this PC now".
Step 4: Select "Keep personal files and apps".
Step 5: Let it install
Once done restart and observe the performance.
Have a wonderful day ahead and stay safe.
Sincerely,
Carlo T.