No, Boruto is alive in the manga. The plot hasn't led to his death. However, the manga is ongoing, and anything could happen in the later developments.
Yes, Boruto is indeed a manga. It expands on the Naruto universe and offers fresh perspectives and storylines. Many fans enjoy reading it to delve deeper into the world created by the series.
No. The official Boruto series is focused on the growth of Boruto, his friends, and the new generation in the ninja world. Fanfics are often creative interpretations by fans, but this one sounds like it's not in the spirit of the official series at all. It's likely a non - official and inappropriate creation that has no place in the official Boruto story.
There were many novels about time travel that took place in the elven base or in the elven race, such as Back to the Elven Kingdom, War of Time Travel and Elves, Rise of Time Travel Elves, and so on. These novels usually described the protagonist transmigrating to a certain elven kingdom or elven base and having a series of interesting stories with the elves.