IME, you can't decide that you've hit bottom- you know it, or you don't. There were about a million times I "should" have hit bottom- and seen it for myself, and stopped. I didn't stop til I chose to.
Indeed, a "high bottom" can keep you drinking. Or you can stop at the small stuff (feeling bad, missing work here and there, etc). Those folks are lucky and smart. I had to go way, way, WAY further- to the brink of death by liver disease in the form of 12-18mos to live. Not to mention all the OTHER baggage and damage I had accumulated.
I don't think we can wish for a glowing sign from above to stop - but I think when we get the one that we really "get" it's time to make the choice, finally.