iOS 10.3.2 Downgrade No Longer Available
If your iPhone 5s starts struggling on iOS 10.3.3 you're stuck (unless you're willing to move to iOS 11 beta) until iOS 11 arrives.
Apple is no longer signing off on iOS 10.3.2 which means you can't downgrade iOS 10.3.2 if you can't stand iOS 10.3.3. The company isn't signing off on anything older than iOS 10.3.2 either.
This is a permanent change. Apple won't bring back iOS 10.3.2, iOS 10.3.1, or any of its older iOS 10 upgrades.
If you're curious about how the downgrade process works, take a look at our walkthrough.