how to lower insurance payment on this 2006 car?

Based in New York. I have GEICO

3 cars, and 4 drivers..

my 2006 NISSAN ALTIMA $980.10($163.35 /mo)

the other 2 cars are newer and also around 900s

What do I do to lower the 2006 Nissan Altima since it's an old car? should i downgrade from full coverage to liability?

What changes should I made, like number wise what should I tell them to change?

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this is how my insurance look like.

• Basic Personal Injury ProtectionBasic Non-Deductible
• Comprehensive (Excluding Collision)$500 Ded. With Full Glass
• Collision$500 Ded.
• Emergency Road ServiceI Accept this coverage
• Rental Reimbursement$50/Day, $1,500 Max

This for all 3 cars:

• Bodily Injury Liability$100,000/$300,000 Spousal
• Property Damage Liability$50,000
• Uninsured Motorist Bodily Injury/Supplementary Uninsured Motorist $100,000/$300,000