Can you access the db or file manager?
whois the domain name for host details and have them give access.
File manager -> wp-config.php for db access details.
phpmyadmin -> db -> wp-user table -> then ether of these options
option 1: take over existing admin account
generally the first user is one you want. confirm it has user status of 0.
update user_email address to yours and clear user_pass. now go to the wp-login page and hit “forgot my password”…
option 2: make new administrator account.
It’d be an extreme circumstance for someone passing and no one being able to at least give file access.