Best Upgrades

I’m looking to make an upgrade or two to my gravel bike and would love to hear what upgrades you guys have found to be the most worthwhile.

I’m currently riding a Felt Breed with SRAM Rival XPLR, Reserve 44|40 wheels. I’m mainly looking at things like drivetrain, cockpit, contact points, etc.

For those of you who race and/or ride a lot of gravel: what’s the best upgrade you’ve made to your bike, and what made the biggest difference?