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~ds worked for me with the basic Kindle of the same generation as yours (bought in '15). It didn't require rooting. Did you enter the command into the search field? That's where you have to enter it. Did you reboot? If you reboot, the change goes away. There shoudn't be any need to press the power button if the screensaver never comes on. That's the advantage of the ~ds hack. The Kindle always displays the page that was showing when you left the device. When you pick it up again, you can just tap a page turn or tap whatever you want to do.
I stopped using the no screensaver hack when I noticed that it was a battery drain, because the infrared or capacitive (I forget which it uses) sensor uses power and is always on when the screensaver never comes on. Also, with the screensaver never on, unintentional keypresses are common when you put the Kindle in your pocket or anything slightly comes into contact with it. The only way to avoid that is to hold the power button in for 10-15 seconds and tap "screen off" when a popup appears.
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