I would suggest Arabia to ween yourself off of just going for science victory every game (or cultural/diplo). I used to just get 4 city start and then push straight for a SV every game. I would suggest Arabia because in my experience you will revert to turtling out of habit and they are are strong civ for that with there economic advantages so you're not shooting yourself in the foot for picking say the mongols and turtling with them.
Another fun strategy I've been doing lately is playing Carthage on Pangaea and only making coastal cities and literally just puppeting every coastal city the AI puts up. Maybe not optimal on pangaea but when you've played hundreds of games as I have, weird strategies makes the game interesting.
One game I decided to roleplay like the AI. I assumed an aggressive, religious attitude toward my diplomatic relations with other nations. So I went heavy religion and militaristic. Any nation that would not adopt my religion I would act hostile towards and any nation that did adopt I was peaceful with. Just different ideas to make the game more fun for you.
I did the same, one of the best games I ever had. A Game to unite all CS's with Austria is awesome too.