...encrypt it and put it somewhere safe. Just so, if it goes offline your data remains safe.
Should use bitwarden or keepass as mk4 mentioned instead of lastpass, lastpass can be said to be the worst password manager app with many attacks in the past. I am also using bitwarden, but just to create and save regular passwords, passwords related to bank accounts should not be saved here, especially never save private keys here. Although these apps haven't been hacked like lastpass, there's no guarantee they won't be hacked in the future.