I'll be honest, dude, it is pretty bad. You really need to rethink how you play the game.
A few thoughts:
1) Teching: If I see things correctly, Alpha was obtained - I assume in trade
2) Ugh - too few workers and too many unimproved tiles.
3) Caste System is just silly to run now.
4) City Placement: Your cities are not exactly bad. Utrecht is decent, but I suspect you are adverse to overlapping cities. Rotterdam would probably be better placed further south and West to simply have better land - ice marble is certainly not better than more green tiles and a riverside grasshill. Cow horse could probably be a bit north as well with a 5 city to the south for rice/gems.
5) I really see no directions in this game. It is like you are just going through the motions. You've built a couple of HOrse Archers and, I think, a chariot, and have them on the other side of the map doing lord knows what.
6) Make sure you are trading for every bit of gold per turn you can and renegotiate trade whenever possible to get more. Trade old techs for gold. If you don't have the gold to finish a tech, run some binary (or 100% tax) until you do.
7) Absolutely no reason to have just 4 cities at 150 AD on Prince. That should simply not happen. No reason you cannot peacefully expand more, but ideally you can start conquering early
Here's what I would have recommend you do here:
1) As this is prince, I probably would have expanded quickly to 3 or 4 cities, getting horses online. On Prince it is fairly easy to rush run or two neighbors with chariots, or you could just wait to get HBR
2) Beeline Alpha, or just get AH/BW and tech HBR..either way, get HAs online asap and go kill kill kill. Much of your expansion here could have been done via war. Currency would be next priority for trade routes and gold.
3) Keep killing and taking
So, overall, you are simply not being aggressive. Even if your goal in the game is to play a longer game - like Space - you should look to expand your empire one way or another. But you could also just use HAs to destroy the map fairly quickly - potentially winning conquest in the BCs or thereabouts.
Again, note that if your cities are working unimproved tiles, you either should be whipping or you dont' have enough workers - or you are poorly managing your workers.
Keep in mind here though that I can't see the actual actions you have performed between 4000BC and now. What I mean is what your cities have been doing and how you manage them. Were you using Slavery? etc...I'd assume there is much improvement in this area such as how fast you get out settlers and workers. How fast you get up granaries and stuff.