hi! I have a feeling this question could come under several possible subreddits, e.g. /r/AskLiteraryStudies (sci fi, mythology, or any other lit), /r/AskAnthropology or /r/AskSocialScience (mythology, and I would be particularly curious about shamanism), /r/AskScience (scientific investigation)... maybe /r/AskReligion (spiritual travel)? In any case, there's lots of room for input on this from various angles; in the meantime, you may be interested in a few earlier posts:

• When was the earliest recorded mention of the concept of time travel? Did people prior to our modern age have a desire to go back or forward in time? How did they perceive the idea of time travel?

• How old is the idea of time travel?

• What is the earliest mention of time travel?

• Did the idea of backwards time travel exist prior to the 1700s?