In the 2016 men's NCAA volleyball finals it looked like a conservative serving strategy ended up backfiring pretty badly.
Sometimes the highest probability of match success comes from taking a more conservative approach to how you go at attacking the opposition.
In terms of causing your opposition offensive problems, sometimes attacking Zone 1 can be an extremely useful serving strategy.
In a reversal of some previous good luck, I once had to field a totally cobbled together team in a Cup quarterfinal. I was surprised at how well it went!