Very interesting game, the Ottomans are certainly emerging as a significant dnager, how are their tech levels at present?
I agree with Chief Ragusa, that core in Austria could be very valuable, hopefully the next war they become embroiled in won't be so one sided and will offer you the opportunity of a cheap conquest.
Bohemia looks to be a lses valuable ally now, ideally you'll be able to take your core from Austria and improve relations after that, but in the short term Poland could be a useful ally for when the Turks inevitably come knocking for those Balkan provinces of yours. Hungary could also be a useful ally, they generally field a decent sized army and at very worst would buy you some time in a war against the Turks.
I agree with Chief Ragusa, that core in Austria could be very valuable, hopefully the next war they become embroiled in won't be so one sided and will offer you the opportunity of a cheap conquest.
Bohemia looks to be a lses valuable ally now, ideally you'll be able to take your core from Austria and improve relations after that, but in the short term Poland could be a useful ally for when the Turks inevitably come knocking for those Balkan provinces of yours. Hungary could also be a useful ally, they generally field a decent sized army and at very worst would buy you some time in a war against the Turks.