I've been thinking about AGI tuning quite a bit recently in preparation for my retirement. If you're living off of your investments, you kind of get to set your own AGI to whatever level is most advantageous to you, and generally lower is better.
But if your concern is just paying less in taxes, then there's low hanging fruit outside of just lowering your AGI. This year we're getting a $9k tax credit for installing solar panels. Kids are worth a small fortune. Tax loss harvesting will cut $3k/year without trying too hard, assuming your portfolio is large enough for you to incur losses somewhere. There are a bunch of little credits for moving expenses, classroom expenses, and tuition. There's the $2k Saver's Credit if you put $4k into an IRA. You can bunch your property tax payments into one year when you itemize, and then take the standard deduction the next year. There are all kinds of tricks related to running your own business, even if that business is just getting paid $20 to watch your neighbor's cat while he's away.
Tax planning is a vast and intricate subject, but it pays you very real dollars to learn and understand it.