The Lord follows every apostasy with a new dispensation and a restoration of authority. Here is a short film produced by the Church which shows how the current dispensation was opened through the young man, Joseph Smith.
This is the second half of the same film.
“Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you” (Matthew 7:7).
Heavenly Father will answer your prayers, too. Ask Him whether Joseph Smith was a prophet.