Can I find my bitcoin private key?
Don't you have access to your bitcoin wallet? You focus should more on the seedphrase which is from where the private keys were generated. If you have the seedphrase to your wallet, and want to restore your wallet, you can import it on Electrum wallet to gain access to your bitcoin.
I don't even know why he wasn't all direct and straightforward with the question. I mean he is asked if he can find his bitcoin private key which obviously he can because he is the one to know that and if he has forgetting or lost it then the use of his seed phrase will definitely come in handy as he need to just get a similar non custodial wallet which can be electrum or any one he is using then and just simply migrate the wallet to that place and set up a new private key.