I can see why the Austria-Prussian alliance is pushing you so strongly, once the green giants finish up in Asia they're going to start looking for something else to eat and aside from a few colonies they're the most obvious and most valuable target.
That has nothing to do with each other; OE is very happy to be left alone and watch the european wars enfold. Its fun to watch actually.
russia and the ottomans are going to get nasty. also, the netherlands have a suprisingly strong economy, and i'd expect them to take a large tech leap on you all, dpeending on how depening they ar eon minting. i expect those endless wars are going to end in the supremacy of either austria or you in germany.
too bad tird parties are not willing to involve themselves. altough i expect them to have their own conflicts. any other major conflicts or rivaly's going on?
edit: if the green giants are going for europe, i think the best would be too make a european alliance of italy, france, prussia and austria to face them. even the green giants owning asia is not enough to take on all of europe, with its huge tax and manpower. especially as revolts and all require many troops back there, while one or two armies the man are enough to cover europe.
The Ottoman Empire has a slightly higher tech speed than Netherlands, so he wont get a tech leap on me. Given that wars are very costly, theres no reason for either russia or OE to involve themselves in european matters. OE is still happily eating up the remaining mughals and Russia is doing the same with Ming. Especially Russia needs time to catch up techwise, currently they are quite a bit behind in that regard.
But especially Russia only needs like ~50-100k troops to patrol its entire border due to the insaneness of Russian patriarchate coppled with a few other decisions/national ideas like ecumenism. At least that will be so once hes finished converting which might take a while. If well played russia has around ~2 or even less RR everywhere.
OE is less priviledged in that regard though but i should manage to reduce it to around ~ 7 in every prov which is acceptable for fighting a war at max we.