I believe this is a mempool issue and not Bluewallet since the fee is correct to the suggested fee on mempool. What's happening on the blockchain?
Even it is happening recently when the mempool is not congested. But if you compare it with mempool estimated fee for high priority on mempool, it is just slightly different. And sometimes, the mempool fee would have later increased.
I already lost the original seed phrase of my wallet and I’m only holding the private key of my specific wallet address. Is there a way to convert a seed phrase of my current wallet using only my private key?
You can only convert seed phrase to private key, you can not convert the private key to seed phrase. You have to generate another seed phrase to generate the address.
I have no choice on BlueWallet because electrum is not available on ios. I’m not comfortable anymore sending emergency funds using this wallet due to this slow confirmation. The mempool suggested fee is now increasing which I’m afrid that my transaction will be purged.
The best would be to send the fund to a wallet that you have just generated the seed phrase on Bluewallet and also be using mempool fee estimation. I am using Bluewallet and I like the wallet.