Welcome to the forum!
Just a guess here, but the brake springs are responsible for returning everything back to the resting position. So that would be a likely spot to check. Looks like napa has pretty much any normal maintenance parts you could want. New springs might do the trick though. If there's no leaks, and everything else looks good.
I'd probably totally disassemble the brake calipers, and shoes from off the mounting, so it could all be cleaned, and inspected. If you've never done drum brakes before, do one side at a time. Leaving the other side for reference, and take a good picture before starting. The spring mounting holes, are sometimes shared with other things, like emergency brake components, automatic adjuster, etc. You'll want to notice the way their fitted, and which part overlaps which. Usually the springs are a bit different from each other, so pay attention to which goes in front/back. And how they go top/bottom. You don't want them upside down. That's what the picture is for. As well as using the other side for reference, although it'll be a mirror image. Use lots of non chlorinated brake cleaner, walmart has the cheapest. Fighting brake springs, is sometimes a challenge. But don't be discouraged, maybe check YouTube for tips. They're all very similar. Good luck, and keep us informed.