Photos not uploading from Mac Library to iCloud

You may just need to wait. My 5000 item 50GB library took 48 hours full time. Yours is up to 6 times that size. Note that each time you disable/re-enable iCloud the process starts from the beginning - so don’t do that. The sync doesn’t use your full internet speed, and it is normal for the progress indicator to not update for long periods.

Leave the mac on, connected to power, 24/7 with the photos app open.

It is not just an upload - iCloud has to create a Photos Library in iCloud, and any photo you upload has to be checked, if it is a duplicate of another photo already in iCloud. Photos has to look for duplicate albums or inconsistent metadata and to resolve conflicts. It has to be indexed on Apple's cloud servers. The first upload of my Photos Library to iCloud (40000 photos and videos) took more than ten days, even without interrupting the upload. The larger the library, the longer it will take, and not just proportional to the number of photos, as each photo has to be compared to all others.

And Apple seems currently to be busy with maintenance work at the cloud servers, perhaps in preparation for new system versions to come. You may want to check occasionally the status of the cloud services on this page: Apple - Support - System Status . Day before yesterday I have seen some problems with iCloud reported, today Apple is working on Apple Music Radio.