This type of post is very good. It reminded me of a similar situation I had. But in your case I suggest keeping the peace for a while and in the meantime I suggest you invest in production and military power. You have a healthy economy so you can support a large army. Ensure a momentary peace after you have great capacity, make a surprise attack on the weaker nations (which are challenging you). Attack one by one, without bringing together a large number of allies against you, if that happens "force" a momentary peace and focus on one opponent at a time.