Bip39. You should then do a basic recovery by using a command much like the 1 under. (This command utilizes a sample wallet file bunlded with BTCRecover) And you should have penned it down for those who have been hoping to maintain an alternative open up to restore your accounts. https://dailybookmarkhit.com/story19199271/ian-coleman-bip39-https-linktr-ee-bip39-bip39-words-an-overview