You only have to change the switch.
Then it should work again.
If you don’t have the confidence to change it yourself, take it to an electronics workshop.
The part costs 2-3$/€ and is installed in one hour with labour time it should not cost more than 50-60$/€.
To see what kind of switch is needed, open the case.
Because the switch is available as 2 or 3 pin.
It may be possible to convert it to a push button switch, then this will no longer happen.
The Darvoice’s inner workings are not broken because of this.
If its stuck in the ON position or capable to be flipped to that, could always control the power at the outlet end. “Alexa, warm up my tube amp!” Could be an added feature to the box rather than a broken switch lol.