I'm heading back out there for the third time. The way I see it is, the RR line, EAFOTS, Heart and Soul and the Vain Queen clues are all pointing in the same direction.
So head out in that direction and see what you find. There are enough of us out there.
Something that has been around since beta, something that doesn't involve horizons, something someone might have found but not noticed, something out in the void between the galactic arms.
It's not a red door with a sign saying 'well done Commander'. It's not a USS with a thargoid mother ship. It's not anything obvious that you can look at and go 'well, there it is!'
It has been compared on here to, variously, looking for a needle in a haystack, or a needle in a million haystacks, or a needle in a haystack made of needles - but actually, we don't even know what the needle is.
There aren't really that many things it can be - a 'rogue' planet, a Dyson Sphere, an abandoned station, a devastated planet... I think we need to identify as many things we could be looking for, based on our current knowledge, in order to assist in this search. We know (roughly) where we are looking, we need to work out what we are looking for.