I love me some civ 5, Steam has me at over 240 hours played. Yet in all that time I've only ever completed 2 games. This is because in the mid game, maybe around the 1700s, I lose interest. I don't know how to stay motivated and keep going. In the early game I'm very focused, I have my objectives and my plan to complete them. I want to explore and expand my 2nd city here, I want to cut off this land with my military until I can settle it. I need to get my religion founded and get my economy moving etc.
Once the mid game starts (or mid game in my mind at least) I completely lose focus and don't know what to do. There's nothing glaringly obvious I need to do, my Civ is running perfectly fine, everything I work towards seems like a small bonus in gold or culture or science, nothing is essential.
How do you guys stay interested in a game? what do you focus on in the mid game?