Hi Evernight2021,
Thank you for reaching Microsoft Community. I understand that you're experiencing performance issues with your Surface Pro 7+. I can understand how frustrating it can be to have a slow device. Let's try to troubleshoot the issue together.
Firstly, I would like to know if you have installed any new software or made any changes to the system settings before the issue started occurring. Sometimes, third-party software or changes to the system settings can cause performance issues.
Also, you mentioned that you tried resetting the device using the downloadable image, was it the Surface Recovery Image from this page: Surface Recovery Image Download - Microsoft Support and reinstalled Windows through USB Recovery? Did the issue occur immediately after you perform the reset using the image or it worked fine at first then issue occurred again after some time or after installing anything back on it?
Secondly, I would suggest checking the Task Manager to see if any processes are consuming a lot of resources. To open Task Manager, right-click on the taskbar and select Task Manager. Check the CPU, Memory, and Disk usage to see if any process is consuming a lot of resources. If you find any process consuming a lot of resources, try ending the process and see if it improves the performance.
Thirdly, I would suggest running the Surface Diagnostic Toolkit to check for any hardware issues. The Surface Diagnostic Toolkit is a free tool provided by Microsoft that can help diagnose and resolve issues with Surface devices. See: Fix common Surface problems using the Surface app and Surface Diagnostic Toolkit - Microsoft Support
Let me know how it goes.
Kind regards,
Marrion