I’ve noticed when doing reviews as fast as possible on mobile, the small tap zone can be hard to hit sometimes. It seems to be only within the solid line. Is there a chance you could expand it to the dashed area? Or perhaps make the entire field tap-able to continue (since, at least on iOS, one has to re-tap for every new word). You could also keep the keyboard persistent if possible (until the user taps “done”).
Let me know what you think