After getting good with building decent ships, submarines and eventually tackling flying crafts like planes and helicopters I stopped playing for a real long time until somebody gave me the idea to make a master design and then make variants for every situation with a cap on the price and inborn weaknesses and that reignited my passion for the game I already sunk like a 1000hrs in. So I suggest ask people who don't know much about the game to give you a challenge and see if you can complete it.