WhatsApp Chat Backup Issue

My WhatsApp-1 (+91000000000) has 11000+ items and WhatsApp-2 (+9111111111) has around 900 items. I had a Samsung Galaxy S20FE phone, and I used WhatsApp (not the Business one) app, and my primary no. was (+91000000000). With the add 2nd account feature, I have added (+9111111111) and I was working with "Switch accounts". Yesterday, I purchased an iPhone 13 Pro and started using the Chat transfer option through the Move to iOS app. I saw 11000 items being transferred for a while and this was interrupted overnight. When I checked my Samsung phone in the morning, I could see only one account which is (+9111111111), and on my iPhone, it was asking me to resume the transfer or reset. I have tried multiple times and the resume option was not working. I had to reset my iPhone. Now, I tried to set up (+91000000000) this account in Samsung though the second phone 900 items only mapped to this number, and even if I try to transfer to the iPhone, only these 900 items are transferred. I am sure I have this backup in Google Drive and local backup, not sure how to get WhatsApp-1 chats backup. Any help would be greatly appreciated.