Plzzz HELP samsung ote 8 remove chat of whatsapp

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Hello,

days back , the storage was full and suddenly the whatsapp vanished no chat history . I went to setting then chat then last back up it was 2018 eventhough wahats is make backup everyday at 2am then i press Backup it gives me 15 GB to be uploaded to my google drive it takes one day to finish .

Now last backup is updated and give me 11 GB
I reinstall whatsapp in a different phone and tried to restore the 11GB backup from google drive . It give me a message " unable to restore chat from this backup plz skip or get from previous version .

I hold everything to see how you can help me .

All my work in these chat history . Plz hell me how can get my whatsapp back nd i will pay to the one who can help

Plz help me