The return of the dead Loki...or not quite

(You Loki that got into the UVI and that knew what awaited him in the future and how he would have died without getting into the UVI)
After the final victory over Thanos, after many losses, pain and grief, the world rejoiced, the remaining Avengers gradually came together and over time even began to recruit new recruits (think of them yourself, although Spider-Man (Peter Parker) will definitely be among their ranks) with their superpowers.

One day, quiet from any invasions or wars, the Avengers Tower system picked up a strange signal unlike anything they'd ever encountered. They set out and arrived at the scene, and on the discovered carlinates, they found...Loki.