My mistake it is a momentary button am using.
Ok, that's good. Without knowing about the switch you are using, I don't know if it is wired right or not, but the solder points on the edge of the BrewBoard look clean enough. I can't tell what's going on with the wiring for the main power, it's hard to make out what's going on there. If you get power lights on the Arduino Nano and the DFPlayer, then probably there is not a short there.
What happens if you press the activation button? Nothing? With the blade disconnected, there should still be sound. If the LED doesn't blink and no sound plays, it acts like the Arduino isn't programmed. It should be doing *something*. If you've got a multimeter, probe the accent LED pin on the Arduino and see if it is going high once in a while in short bursts. There should be a short pulse every 2 seconds when the saber is idle.