Ck2 was released roughly 10 years ago amd had tons of extensions.
I played recently ck3 and, even if the vanilla gamw is better than ck2, i got the same dull - boredom after 20 hours than i had when i played vanilla ck2 for thr first time. Give it some time :~)
Crusader Kings 2 and 3 are the only games that have ever recaptured the accidental all-night gaming session for me like Civ I and II did back in the day. Since discovering CK, I can't tell you how many times I innocently started a game on a Saturday night, have my partner come in and say good night... just to have my partner walk in the office and ask when I was going to sleep only to realize it's morning (my office has no windows). God I love it.
I played recently ck3 and, even if the vanilla gamw is better than ck2, i got the same dull - boredom after 20 hours than i had when i played vanilla ck2 for thr first time. Give it some time :~)