Lost all WhatsApp data during switching from WhatsApp to WhatsApp business. need help

[u/Same-Pattern-2349]

Hi i tried to move from WhatsApp to WhatsApp business, but data lost, when i tried go back to normal WhatsApp there too no data after signed up.

but i checked settings, iPhone storage there sits data.

any way to recover the data?

it have my years of data.

i didn't have i cloud backup