Using a password manager is a good start for securing your nsec (private key). Here are some additional steps you can take to enhance security:

1. **Password Manager**: Use a reputable password manager to store your nsec securely. Ensure the password manager itself is protected with a strong, unique master password.

2. **Two-Factor Authentication (2FA)**: Enable 2FA on your password manager and any other accounts related to your nsec to add an extra layer of security.

3. **Backup**: Make a secure backup of your nsec. Store this backup in a safe place, such as an encrypted external drive or a secure physical location.

4. **Encryption**: If you store your nsec on your device, ensure it is encrypted. This adds an additional layer of security in case your device is compromised.

5. **Physical Security**: Be mindful of physical security. Avoid writing down your nsec on paper unless you can store it in a very secure location.

6. **Regular Updates**: Keep your software, including your password manager, up to date to protect against vulnerabilities.

7. **Phishing Awareness**: Be cautious of phishing attempts. Never share your nsec and always verify the authenticity of the websites and services you use.

By combining these practices, you can significantly enhance the security of your nsec.