You're well on track for WC in terms of development owned, so you can delay it a bit and stay at peace, because that dip is a disaster. Focus on dip, get level 5 dip advisor and stay at peace for a while. You can use that to strengthen your economy, it is a bit worrying that you have so little money in the bank at the stage of the game (you don't need to fill all your FL so early in the game, wait Imperialism to fight multiple wars at once). Also try to see if you can't push PP over 50 somehow (is Ming/Russia still rivals?).
You don't seem to have a lot of vassals from what I see (but it's hard to judge here), and you have a lazy diplomat. Reconquest wars of tags who might have disappeared (typically the likes of Novgorod, Lithuania, Hungary and Delhi/Jaunpur Bahmanis/Vijay depending on who won) are the best way to avoid paying extra dip before Imperialism, and forge claims all the time if you did not get Religious. Imperialism will not only make wars cost 0 dip, it will also reduce warcost for provinces. So does diplomatic, that's why you usually need it too to WC (instead of 2 military groups early which is a waste, you clearly did not quantity here to outnumber everyone). By not having diplomatic and Imperialism, you basically need twice as many wars, and by being so behind in dip tech you make vassals disloyal.