As Lynn noted, this is very pretty. I think it might feel more "titanic" with more textural elements.
This is your song, but I'll throw out some ideas.
A strong, Knopfleresque guitar(listen to the last part of Telegraph Road).
Percussion. This just begs for some dramatic percussion. Tympani, perhaps?
I get what Waltenstein is saying about the strings, but to me, they are looking for a release, a lead into something more heavily charged.
You've got something here. Work it. And welcome to Sonar.