I recommend using nostr:npub1tm99pgz2lth724jeld6gzz6zv48zy6xp4n9xu5uqrwvx9km54qaqkkxn72 for DMs. I just started using it. It doesn’t let you respond with the deprecated nip-04 spec which leaks metadata. Also check out nostr:npub1h0uj825jgcr9lzxyp37ehasuenq070707pj63je07n8mkcsg3u0qnsrwx8 which uses the signal protocol. You can’t use your existing nsec with keychat though so it’s a little harder to get the conversations started, but better for privacy.