i created an ethereum wallet using myetherwallet in 2018, at that time myetherwallet used private key and didn’t use seed phrase yet.
now i use MetaMask, and until now, the wallet address I created in 2018 became my main wallet.
is there any specific way to generate or view my wallet seed phrase
As far as i know, that’s not possible. Imagine if you get a private key compromised, someone could compromise your entire wallet with all its accounts if that someone could be able to find out the Secret Recovery Phrase with just the private key of 1 of the accounts.