Very different from your usual works, but in a positive way.
I like the medieval atmosphere you create and the haunting melody of your flute and of the singer.
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The orchestra sounds somewhat unnatural because orchestras are typically recorded in rooms with a significant amount of reverberation, which is lacking here.
The simplest solution is to route the orchestra's instruments to a bus/group (depending on your DAW) and add a room reverb to the entire orchestra until you can (virtually) see the orchestra playing there when you listen.
But don't overdo it, there's a fine line between what sounds good and what's drowned in reverb

Only then should you add the remaining instruments and balance them until they fit.
They will probably also need a little (their own) reverb to make them fit perfectly.