How can you explain the strengthening of autocratic power under the first Romanovs?

Power had to be in the hands of one strong and wise ruler in order to prevent more power struggles at court. With the coming to power of the first Romanovs, the time of troubles came to an end.
As a result of the Time of Troubles, there were no competitors left to the Romanovs. As a result of civil strife, many noble families were exterminated or fell into decay. Therefore, the Romanovs had a great advantage as an ancient and large family (although they were overtaken by great persecution in times of troubles).
In addition, a relative of the first Romanov was on the throne of the church, so the autocratic power was also approved by the church (which was very important in the Russian state).