Hello! My name is Mustafa, and I am an Independent Advisor as well as a long-time Microsoft user. I'm sorry that you are experiencing this issue, and I am hopeful that I will be able to help you find a satisfactory solution.
If you are sure that your device has good specs, what about the wifi that you have? do you have a good wife?
can you please refer to this article from Microsoft on how you can sync your files: https://support.microsoft.com/en-us/office/sync...
Please let me know if this doesn't work or if you need further assistance.
Warm Regards,
Mustafa