WS2812B strip stopped responding to control
Did you follow the Adafruit NeoPixels best practices guide?

You may have zapped the first NeoPixel in the group. You should be able to, fairly easily, bypass that. Each NeoPixel has to "reshape" the data for the next one along, so if you damage the first one, no data will reach the others.

I strongly suggest you follow the guidelines in the link, including the capacitor and resistor.