Hello guys, I just want to inform you that my issue has been resolved. So what I did is, I tried turning off iCloud syncing, and rebooting the device and turning it on again but I had not resolved the issue but it could solve your IDK. After that I researched it in many places and luckily found a guide, and followed it. In my case iCloud private relay is causing the issue, as I turned it off now my iCloud sync is working fine.