Unfortunately, my WordPress was hacked by my ex-colleague and I only have one user password in admin mode to login.
Unfortunately, I don't have access to the host and server. But I have access to GTM and 1 user to login without admin access.
Is there anything I can do to return admin access?

Unfortunately, I don't have access to the host and server. But I have access to GTM and 1 user to login without admin access.
Is there anything I can do to return admin access?