So I know Jack has said this one is fictional, but if I may bend the definition of "fictional" a little bit, I kind of feel like this is about the fans. IIRC, Jack was getting quite a bit of negative publicity in 2014-2015, and this could be about needing a way to get his feelings out into music ("relieve me and put it up on your shelf", i.e., let me record it and I hope you'll buy it) but also consciously knowing that it was time for him to take a break. The actual phrase "we're connected by love" might be a reference to being connected by music, emotion, and humanity, and the hope that that connection still exists even though he hasn't released anything in a while. Having this as the first song on the new record, as well as the first single, could be a way of saying "I'm sorry I was so inactive for so long, I hope you still care about me, because I still care about you guys".
So I know Jack has said this one is fictional, but if I may bend the definition of "fictional" a little bit, I kind of feel like this is about the fans. IIRC, Jack was getting quite a bit of negative publicity in 2014-2015, and this could be about needing a way to get his feelings out into music ("relieve me and put it up on your shelf", i.e., let me record it and I hope you'll buy it) but also consciously knowing that it was time for him to take a break. The actual phrase "we're connected by love" might be a reference to being connected by music, emotion, and humanity, and the hope that that connection still exists even though he hasn't released anything in a while. Having this as the first song on the new record, as well as the first single, could be a way of saying "I'm sorry I was so inactive for so long, I hope you still care about me, because I still care about you guys".