Adjacency is annoying. Edda is next to Elentári (formerly Flat Arda) and to Space Arda which yet lacks an improved name; Space Arda is next to all three daeva worlds and Hex, but not to Limbo; all the daeva worlds are next to Limbo and Revelation, which are also next to each other - it takes four hops to get between Elentári and Revelation.
There might be shortcuts, but since their current greatest ability to address problems - especially Enemy-scale problems - in other worlds is the Tesseract, it seems efficient to go places that are adjacent to Edda and therefore within its jurisdiction. It is still grouchy and won't help with anything Loki can't do her own fact-finding work on, so it's worldleapers. Cam goes alone first - it's unlikely that he will land in a star, but not genuinely impossible, and he can then find somewhere comfortable to land and go fetch Loki and whoever else is coming along.
For a while, the worlds they find are more or less equivalent to finding new civilizations within Edda. They have to be discovered differently but they're just places, with people, no alts, no Ardas. They are investigated and put on file for their resources or needs; if there's anything really pressing (planet about to collide with its moon, that sort of thing) Loki fixes it before moving on. Maybe eventually someone from one of these worlds will turn out to be really interesting and they'll be delighted to discover alts of them too but they'll have to distinguish themselves some way in some world first.
Then there's another Arda.
"Another one?" Loki asks.
"Complete with mutually intelligible Quenya," Cam says.
"Enemy an ongoing problem?"
"Yeah, this time I will have a conversation before I destroy him, wouldn't want another close call. Let's go meet the local Noldor."
Where are you, local Noldor? Loki and Cam are there now too.