I've been reading alot about the Abbasid Caliphate and discovered that, despite it's high amount of growth and innovation, it was simultaneously socially and economically unstable right from the get go which in turn lead to a great and slow stagnation. The Abbasids were simply too unprepared to handle the torch which the Umayyads held. Now after realizing this, I made a hypothesis that the decadency of the Abbasid Caliphate may have contributed to not only it's lack of economic development and social stability, but also to the events that lead to it's demise. The Mongol invasion, the Mu'tazila's political brutality, the Ash'ari's well-meaning but consequential beliefs, and the lack of utilizing any inventions made by their own citizens (the Umayyad Dynasty would've certainly made greater use of torpedoes than the Abbasids) could've all been avoided by a smarter and more capable Abbasid regime.
So I challenge all of you to figure out a way in which the Abbasid Caliphate can become more stable and less decadent than it is in our timeline. I particularly address this challenge to all Islamic or Middle Eastern historical experts.