I left Prince not too long ago so here are some thoughts :
Your land is not great but definitly workable. I think you were doing well because you grabbed the Oracle (without ind and marble, meh) and early coast with financial is ok. Now that cities and cottages are growing, you're starting to slow down. That and the fact that you have 5 cities, while Brennus has 13 for example.
City placement is not great. Walata should have been 1 NE to grab the wheat. Djenne should have been 1 SW to grab the clam and both wines. As a result both these cities are much weaker than what they could have been (especially Djenne). Worker wise you are too short, only 4 workers for 5 cities, you want 1.5 per city on average. Gao and Kumbi-Saleh are working unimproved tiles.
City specialization is not that good either. Capitol is geared toward production which is fine, but because of that you don't want to put your academy there. Speaking of which, you don't have any commerce/science city and the result is a horrible tech rate. You need at least one strong commerce city or else you'll have no beakers later (which is now for you
).
Diplo is bad too, nobody likes you, some hate you. You're the only one with your religion, you're isolated. Willem can trade with you at cautious but if possible you want to have a pleased/friendly trade partner.
The war : either take peace or attack. Which means you need construction for attack, or deal some damage to Khan because he wants one of your cities for peace right now. But honestly your situation can't be easily salvaged, especially on long term plan.
I hope you don't take it personnaly I'm not trying to be mean, but overall I think you should stick to Noble for now (that's what I would tell myself anyway
).
