Yeah, it's always a dilemma, go for something more relatable, or a story I want to tell regardless. I've got a space theme going for something else so trying that. I do have a few other poems that aren't space related that I'll probably try to bring to music as well.
I'm finding starting with a poem has been good for me to try to capture the core of what I'm trying to convey. Just my mythology for now but may not always be.
I thought I try a couple and see how they go and see if enough people enjoy them to do some more.
At the end, it should always be about people! That's what we connect to the most.
I get what you mean about relatable. I'm in the process of writing a collection of speculative fiction (or sci-fi, as the kids would call it) - and not getting lost in technical detail or world building, and constantly needing to bring it back to people and their motivations is probably the most important part of it.