You seem to be doing well overall with your financial strategy, so the focus will be on optimizing what you are already doing. The following are a few of the most common practices for reducing your income, although I'd need to understand more about your actual situation to be able to guide you in the right direction. I have also included the approximate amount you could reduce your taxable income by with each strategy.
CONTRIBUTE MORE TO YOUR WORKPLACE PLAN
SEE IF YOU HAVE A 457 PLAN
CONTRIBUTE TO HEALTH ACCOUNTS
SEEK A COMPREHENSIVE FINANCIAL PLANNER