Did you use any hops for the boil? How long in the primary?
I would leave it as it is and take some notes on what you did (times, ingredients,
tastes at various stages, etc) and chalk it up to experience. Your beer will taste different in a week, in 2 weeks, in three, and four. Let the yeast do its thing and carefully sample on various stages on the way (maintaining sanitary conditions).
Your notes will help you next time to adjust hops, alcohol by volume, carbonation, etc.
PS.. it is possible to add hops though.
Primary : 5.5 G of Hard Cider
On Order: Got it all..for a few months
Thinking about: Plisner malt and saaz hops
Drinking: 5 G- Kidney_Punch Wine, 10 G Canadian Pils, Euro Pilz