Dear brother,
Jesus was very specific when we told his disciples that he would be with them ALL days until the end of times. This discards any "Great Apostasy" theory. Combine this with the fact that just as the 12 apostles were ordained by the Holy Spirit, similarly the episcopes were ordained by the Apostles and thus by the Holy Spirit, and this was to continue (As Paul instructs Timothy, who was ordained by him, to ordain other episcopes in turn.) Thus, you must find which Church has a continuous existence from 33 AD to 2023 AD, and at the same time continues the apostolic succession, uninterrupted.