How can I recover iCloud of lost phone

Greetings James_kate,

If the steps included in the related article above your post have not resolved the issue, the next step will be to Contact Apple Support directly for further assistance.

Take care.

Turn on lost mode in iPhone Use Lost Mode in Find Devices on iCloud.com - Apple Support

Use your Apple ID and password to get signed in at www.icloud.com from a web browser How to sign in to Find Devices on iCloud.com - Apple Support

And then archive the iCloud data Archive or make copies of the information you store in iCloud - Apple Support