Well, "remain evergreen in my memory" is an implication that the thing they are talking about is something they will never forget; this is kind of a metaphoric statement, as an evergreen is something that never loses its green color. I would need more context for the next things that you wrote, but "strapped my bag to my neck" could mean numerous different things. Maybe that the person wanted to emphasize the fact that they do not want to lose their bag, so they said they were strapping it directly to their neck? I'm not sure about that one, as I said I would need more context. If this helped you at all I would appreciate it if you gave me a "brainliest answer!" Let me know if you need anymore help :)
