This is inspired by the far more frequently broached topic of Frederick and Prussia facing disastrous defeat in the 7 Years War.
This challenge seeks to obtain a result that is 180 degrees or 90 degrees the opposite.
In OTL, Frederick seized and kept Silesia in the war of Austrian succession.
Although he still held on to Silesia by the end of the 7 Years War, his territories were ravaged and he was attacked by neighbors and in great peril much of the time. The 7 Years War was in many ways one big long hangover that Frederick earned for his 1740 binge on Silesia.
How can we make things better than OTL for him and Prussia?
I would categorize most versions of doing "better" than OTL in two possible ways:
1) Prussia staying at peace for most of these decades (using whatever diplomatic configuration you think most plausible) and getting by without a lengthy war of Austrian revanche.
...or
2) Prussia becoming involved in war (in whatever alliances you choose) and coming out of it at less cost to itself and/or having gained additional territories as spoils of victory.
PoD has to be after the Treaty of Aix-La-Chappelle. But after that, everything is on the table including internal political changes in other European powers, the diplomatic revolution, battlefield results in an alt-7 Years War.