Safari bookmarks aren’t syncing with iCloud

Your Mac is now a vintage model https://support.apple.com/en-in/HT201624

See the article https://support.apple.com/en-in/HT204416

You have to upgrade the Mac https://support.apple.com/en-in/HT201475

But keep in mind check the compatibility , the manufacturing year of your Mac is 2008 , doubt it you will get upgraded version from App Store , check with your friends or Mac genius bar / apple authorised service centre do they have Mac OS on USB bootable flash drives https://support.apple.com/en-us/HT201372

So that the os can be installed on Mac .

See the article https://support.apple.com/en-in/HT203519

Make sure you are not exuding the designated iCloud storage limit .

If you can open the website from the link in your post, you are accessing the ports.

Then you are accessing the ports.

I'm not sure this still works.

Safari - How to Force Sync with iCloud