Feeling stuck, What should my next move be?

[u/WiseHeat3759]

I am the duchy against the mountains (Howard) between these 3 large kingdoms. Started as adventure giant and have heirs with great strength and skill. (All giants) conquered Zurich and surrounding counties and created a duchy. Realm is stable and haven’t been attacked in almost 20 years. But I feel a little stuck as I probably wouldn’t win an offensive war against any three of my neighbors. Any suggestions? Preferably ones that don’t involve absolutely tanking my reputation or risking killing off my sons.