A church of one is a contradiction of the meaning of the word church. It is greek for "ecclesia" and means "the called out ones..."
The only way there can be a one is if he rejects the fellowship with others or does not admit to the fellowship with others.
Yet, one cannot just go to any church, for he must practice discernment. It may be that the time has come, to avoid churches. They may be dangerous to your spiritual health.