Here is what I know:
In here I don’t remember if Loki falls to midgard or jotunheim from the bisfrost, but he does fall throw time as well. He becomes a space trafficker with a mysterious reputation and a nickname I can’t recall. I think his new name is Larchlan, or Lachlan. He has a big talking wolf but I‘m not sure if it’s fenrir/fenris. He says “don’t rock the boat” and there is one scene in which he threatens a realm with McDonals and junk food. He is also helping Bucky with his memories.
I’m pretty sure it’s over 100k and on ao3.
Edit. FOUND IT! It’s Plausible Deniability by lord_hades