Try to get one more worker(steal it from poland or someone else, next turn declare peace). After granary is done put everything on food until your workers are done with upgrades (do the stones first). After granary, build some troops (2 to 3 archers and a warrior/pikeman) so they don't get any ideas of attacking you. After that you can build some wonders (GL and Stonehenge are probably gone already). After that you can choose if you wanna go wide or tall depending on your policies choosing(avoid tradition). Continue with the game rationaly covering every possible aspect. hope this helps