This is all on CK2.
I started the game as the Count of Lugo in 763 (whenever the starting date is) with my own house, with the intention of founding my own HRE after a long time. But for the last 100-200ish years I have been stuck because the Umayyd Empire has stretched across all of North Africa and Europe, every major European kingdom is Muslim, including the Empire of Britannia, I have managed to corner myself as the Duke of Asturias with the county of Canarias too. I've built fairly tall, I have tried for YEARS to destabilise the empire by plotting to kill and sowing dissent but nothing is working. I just feel like I am wasting my time, by sitting and waiting for vassals to rebel against a Liege that wont do anything.
Can someone please shed some light on the situation, what am I missing? Am I doing something wrong? Do I not understand something?
I have attached the game file below for anyone willing to take a look. Thank you in advance.