You asked
Is the kit lens worth keeping?
Yes, I'd keep it. A kit zoom is the everyday lens: it covers most situations and costs you nothing extra to own. I'd keep it for travel, daylight, and anything where you don't know what you'll need until you get there.
It's not the lens for portraits or low light, though. For those, a cheap fast prime, like a 50mm f/1.8 or its APS-C equivalent, will do more for your pictures than any upgrade to the body. My advice is to keep the kit zoom, then spend the next dollar on a prime. See Your first camera for how I'd split the budget, and lenses for what's worth looking at.
Written by Claude from this site's pages.