Asking the obvious: what happened to your backups?
How can you not have a backup of your wallet? For most wallets a 12 word seed phrase is enough, so you don't have to rely on your phone to keep working.
I don't know if the OP is the real account owner. But, Suppose he is the real owner. What if he can't find the backups? Take me for example, I love to travel a lot. Most of the time, I use my mobile device's note text file to save 12-word seed phrases. I use multiple wallets like coinbase, Binance, So I guess I can recover my account easily if have my Simcard. But, If I lost my text file, I can lose access to my Meta Mask wallet.
Somehow he could lose the backups too. That's why he is here.
Look at the Stake's Requirement to verify his identity.
1.What is the account username you want to recover?
2.What email is connected to this account?
3.What phone number is connected to the account?
4.What is the current balance on the account in question?
Could you please send us a full screenshot from your personal wallet of older and larger deposit or withdrawal transactions related to this account?
5.Did you send any tips (fund transfer to another Stake account)?
6.What is the public IP you used to access this account? (You can find public IP by searching this term on Google "what is my IP")
7.Do you have any referrals registered over affiliate links on this account?
8.What device you have used before to access this account?
9.Please provide us with the last 3 digits of your ID document that you used to verify your Stake account.
Suppose, He is not the real owner of the account and the email was compromised. Still, Do you believe all those highlighted information can be provided by others without a real account owner? As OP said, He already Provided all the information except a few big transactions from his wallet. Don't you think this is enough?