+1 everything sbillard said. Verbatim.
I did decide to ‘restart.’ As stated, the only way to do this (presently) is to delete the device. I did this, thinking I’d be fine with my connectivity, suspecting (correctly) that WiFi parameters are maintained without need for re-input.
But, what I didn’t know is at the cloud end, you can’t ‘partially delete’ (remove everything but account parameters). The Blink process is still required, even though done successfully before.
So it was only via the kind help of franz that I got restored at the cloud end (doing blink up process might not work for me - actually should have tried it since I have updated firmware now).
Summary: don’t delete if your blink up process is marginal or doesn’t work. When you delete a device, you have to go back all the way to the beginning, including setting up your account, including having to use the blink process.