Error message while transferring whatsapp data from Android to iOS

I am trying to import data from my Android(Xiaomi) phone to iPhone 15pro via iOS transfer app. I have tried 10-12 times till date and still getting the same error of data not successfully getting imported. After 40% completion it will give error. Have spoken to Apple helpline number as well as whatsapp no major help is been provided. Its been 1 month since i have bought this phone and still trying to import my whatsapp data.

Can anyone please help me fix this issue.

I have seen few recommendation in the portal to first transfer whatsapp data first then remaining data and more such option but nothing is working.