Hello, NiranN1.
Welcome to Microsoft Community!
Surface Go 2 you may indeed consider going back to Windows 10 in order to continue using it if its performance drops significantly after upgrading to Windows 11. Although Surface Go 2 is able to support Windows 11.
I'm here to share with you a way to reset it completely, it's not difficult:
You will need to have a USB drive ready and preferably on another well-running device to visit the following site for a dedicated recovery image for Surface Go 2:
Surface Recovery Image Download - Microsoft Support
Get it by logging into your account and entering your device's serial number:
After completing the creation of the recovery drive, continue to refer to the guidelines in the following link to complete the recovery operation:
Creating and using a USB recovery drive for Surface - Microsoft Support
The link shows us a complete demo video and key textual guidelines:
By following the steps above, you will be able to complete the reset and go back to Windows 10.
In fact, for the Surface Go series, you can understand it as a simple version of Surface Pro. But I'm also frustrated with how this performance issue has caused you problems.
The hardware specs of the Surface Go 2 may not be able to run Windows 11 at its best performance.
After restoring the device, I recommend you to manually get the driver and firmware installer for Surface Go 2 to maintain the device performance:
Download Surface Go 2 Drivers and Firmware from Official Microsoft Download Center ****
Please reboot your device after the download is complete to apply the driver updates.
I look forward to your progress and always support you.
Best Regards.
Leo.L - Microsoft Community Support Specialist