Usually CyberPanel will automatically issue Let's encrypt SSL cert for both www and non-www version of domains, but if in rare case it failed to issue WWW cert , you can extend the SSL for www domain manually.
1. Run command (change example.com to your domain for ALL steps)
certbot certonly --webroot -w /home/example.com/public_html -d example.com -d www.example.com
and enter E during operation
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2. Now new cert is issued successfully, we need to replace them with existing ones.
ls -ln /etc/letsencrypt/live/example.com
and finally restart LiteSpeed Web Server.
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systemctl restart lsws