In my saved project, I lost color grading after logging in again in Adobe Creative Cloud. Need Help

If you have a good copy / autosave

Make 20 copies of that (or however many makes you feel safe) onto different drives and devices.

Make one copy in the folder where the original is, and give it a good name, w/out the autosave.

Proceed with caution.

There's no way to lose part of a project, and still have a valid .prproj file; items cannot be removed from a project, without user action.

Do you have an auto-saved version of your project, that does still contain color correction work, and the old font?

Any color grading changes should have been saved in that .prproj file, regardless of Creative Cloud login state. 

Is that not the case?