The reason for the crisis of the Ottoman Empire in the 19th century?

When a crisis occurs in any country or state, this crisis always has reasons or prerequisites. There were several reasons for the crisis that struck the Ottoman Empire. Firstly, those frequent uprisings that we observe from the Balkan peoples against the Ottoman Empire became a serious reason for the crisis that began. Secondly, the war with Russia, in which the Turkish troops had very large losses and costs of maintaining the troops. Thirdly, the internal problems of the state associated with the Janissary corps.