Photos taking forever to sync to iCloud
I ran out of space on my Macbook Air and realized I had over 100gb of photos, so I upgraded my iCloud account and am trying to sync them. I've followed all the correct steps, but they are taking FOREVER to sync. Literally every time I'm on my computer in the past 3 weeks, I've left them syncing and only about 1,500 have synced to iCloud out of 20,000. 635 of those have gone into an "unable to upload" folder in Photos. How can I speed this up? What is wrong here?
Thanks!
MacBook Air 13″, macOS 10.14