Led Bulb (White)1S blinks after being turned on, cannot connect, cannot reset

Hi,
I’m having a problem with my LED Bulb (White)1S which was connected to power for quite some time but was not used for a few months. When I recently turned it on, I noticed that the light was not constant - the bulb ‘blinks’ every 0.5-1s and what is more, slightly changes intensity with each blink. It can go up or down, randomly. I tried to connect to it through my Yeelight app, but it could not find the bulb through its last saved profile. Of course I tried to reset it by turning it on and off for 2s intervals, but that did not help at all - the bulb behaves the same every time it’s turned on.
Is there anything else I can do in order to reset the bulb so I can connect to it and control it again? I can’t even use it as a regular bulb due to blinking issue.

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