Currently have restarted 3 times where factions are no longer declaring war on each other after the initial onslaught at the start of the game. Usually, the problem is there is too much was however in my case i spent all day yesterday in game waiting for a war to start but none of the factions are at war except with minor factions. I am currently playing in 1.5.7. Also i am using diplomacy fixes as well cause i thought it could fix the war exhaustion mechanic. I even tried proposing war on multiple factions and everyone didn't want war which was weird as well. Please let me know if anyone else is experiencing this and maybe a solution to the problem.