Start with the basics.
What yeast did you use?
What was the rest of the recipe?
What was the OG?
What is the current SG?
How long ago did you start this?
What makes you think it has lost its "umph"
Answers to these questions will allow the experts here to respond with the correct answer for your situation.
Primary: 3 gallon cider S-04
Secondary: Valentine Apfelwein Clone 1 Gal
Bottled: Halloween Apfelwein Clone 1 Gal
On Deck: 90 Shilling Clone