Hey There!
In the breakdown part maybe try to use another instrument (from the ones featured in the first part) to keep the rhythm a bit tighter than the string pad. Then the string pad could join in the second part of the breakdown along with fast hihats or tambourine (but this might be too much for a breakdown, experiment a bit here to find out how to build it up the right way).
And, as Music2Sync said, after the breakdown, come back with at least the same amount of energy as before. But more would be the real aim. Maybe try some snares to add some extra punch in the climax.
Cheers, and good luck!