Try allying yourself with protestant states like Hanover and Hesse-Kassel first, Bavaria is more probable to go in an alliance with Austria. The old and paternalistic Holy Roman Empire is torn by the rivalry between the Habsburgs and the Hohenzollerns and they will try to unite the German Empire and bring it under their hegemonies Austria and Prussia are not likely to let another Polish-Saxon union happen and any ties with the Polish kingdom threaten Saxony's sovereignty so keeping a balance is essential Although you are in an alliance with Prussia, having a decent standing army would prove useful not to mention the danger of another war with the Habsburgs Crisis in Europe and France's inability to take any action have only encouraged Joseph II in his ambitions.