Go through your spellbook. Find all those d6/level spells. Now ignore most of them- they're largely redundant with each other and the damage isn't all that impressive unless you focus on it. There *are* good and somewhat hard to replace spells in Evocation- in Core alone, you have native access to Contingency, Wall of Fire, Ice, Force, and Wind, the Bigby's Hands line of spells, Shatter, Prismatic Spray, and Resilient/Telekinetic Sphere. Focus on careful use of those and any other similar spells that you can find in allowed sources and you can do a pretty fair job of control and debuff even as an Evoker.