I personally overcome the boredom of the end game by starting the game out with a monument goal in mind. Of Course these are self imposed rules or goals but it definitely solves the late game boredom problem. For example, if I am playing with Hydrocraft on, my go to challenge is solar park. I have to set up my base in the first week of the game. Thats my permanent base and i cant spend the night outside of my base two nights in a row until i make the solar park. This proven to be impossible challenge for me since once i survived 4 years and still hadnt been able to make the solar park. Another example is the vagabond challenge, this has nothing to do with any mods, you just cant set up a base you have to leave your current city every 7 days. Or pilgrim challenge; start out on one side of the map and you cant set up your base until you get the other side of the map and once you get there you cant stay more than a season before you have to leave it. No burn challenge is also fun, you cant burn zombies ever, ect... Also even if you dont have any goals you start out with, cabin fever is the number one killer in pz. Boredom will make you slip up and get killed eventually which is literally the purpose of this game, the story of how you didn't survive the zombie apocalypse. So in a way the game is working as designed...