A game of diplomacy isn't about guarantees. Also, I'm a reactionary player, so if I can't build another fleet, I come up with a new plan. It's a similar mentality as the Oregon Ducks football team under Chip Kelley, the "Next Play" approach. You attack, each and every play, get everything you can get, then focus on the next play. If I can get a build, I take it, and figure out what to do after that, always confident that I can come up with something, never looking back, always pressing forward.