Unencrypting private keys from keystore file and password

Sorry if this sounds basic. This isn’t a “I lost my keys” post.

Back in the early days I had an Ethereum wallet. It required you run a full node of ETH using geth on your machine starting with downloading the entire chain. You had your public keys and your private keys were stored in an encrypted keystore file.

This wallet software now seems defunct and few want to DL the entire chain now anyway.

To make a paper wallet, how would I “recover”/unencrypt my private keys from the keystore file and my password?

DMs on the subject will be ignored.