Best apps for managing mobile data usage efficiently?

I've recently noticed my monthly mobile data burns through way faster than I'd expect, even though I don't stream much video or music. I’m on a limited plan, so this is starting to get annoying (and expensive). I’ve tried checking my phone’s built-in data usage stats, but it’s a bit rough to figure out which apps are the real culprits or how to throttle them effectively. Has anyone found good apps or tricks to monitor and control data usage better? Maybe something that can alert you before you hit a limit or restrict background data for specific apps? I’m using an Android device, if that helps. Would love to hear what you all use or recommend to keep data usage in check without killing the apps I actually need working in the background. Any advice or personal experiences would be awesome!