I use the WP Clone plugin https://wordpress.org/plugins/wp-clone-by-wp-academy/#reviews to ‘clone’ an existing site to a new site. Quite easy to use: install on ‘old” site then backup; install on new site, restore from the backup url you get during the backup.
Quite easy to use, and usually reliable. I’ve sometimes had to backup/restore a second time to get it to work, but not a big effort. You’ll need to log into the new site using an admin user from the old site after the restore.
Easy enough to clear out content, etc. Have used it many times; good stuff.