The "stay strong" at the end of And The Day Goes On is arguably my favorite part of the song, and I've taken that message to heart. It's helped me through some shit, multiple shits in fact, so personally I see  a deeper meaning in it. When you wrote the line, was it just what worked the best in that moment for the song, or did it have a deeper meaning for you?
'stay strong' is already a very meaningful phrase. it is a very meaningful thing to do. combined with expressing it in the most meaningful way possible with the arrangement, placing the tempo slowdown in a precise way, and the vocal delivery, hopefully all added even more to support the meaningfulness