Reducing LED circuit current
There are a few ways:


Increase values of current-limiting resistors to reduce current through LEDs. This will make them dimmer.
Reduce LED quantity.
Replace LEDs with more efficient (brighter per mA) versions, then lower overall current with higher value resistors (see #1).
If your LEDs do not need to be on simultaneously, you could multiplex them so that only one or a few are actually on at a time. This would require a different circuit altogether as well as a microcontroller or something to drive them.