I had a nearly identical situation and found the same results when googling what to do! After fiddling with the speaker, I connected it back to the charger I used and saw the light flash red (which means that it had to still be working) and as I did that, I held the ‘on’ button for around 1-2 seconds and the blue light flashed on as it connected to my phone.
In my case it might have just been a slight mishap for the EWA speaker, but maybe you shoulder try pressing the on button at any sign of life, like the red light when the speaker is charging!
That seems like the only easy way to fix it!
I don’t know if my speaker will continue to not turn when when it’s not plugged in, but if that’s the case I’ll just have to turn it one when the light is red all the time 😅!