Let us say Peter III avoids Catherine's coup. Perhaps Elizabeth lives longer and the Prussia carve up happens before he comes to the throne. A combination of less anger over his 7YW reversal and butterflies means he is tipped off early enough and Catherine ends up in a nunnery.
How far does he get against Denmark? Does he successfully take back Holstein? Does he go further and claim the Danish throne? How do Sweden, France, Britain and Austria react?
How far does he get against Denmark? Does he successfully take back Holstein? Does he go further and claim the Danish throne? How do Sweden, France, Britain and Austria react?