Shop around and make sure the quotes you are comparing match your current policy.
Talk to the agent about higher deductibles for comprehensive and collision. The higher the deductible the lower the premium.
Most agents will tailor the car policy to your needs including applying discounts that may lower your premium. Its still best to ask the agent if there are any discounts that you may qualify for to lower your insurance rates.
Last but not least, the most important way to keep your insurance rates low is to maintain a clean driving record.