The best proposal so far is growth with speed of light in all directions.
> Do we really need growth or do we need happiness?
What about the people who are not happy when our knowledge about world, and the number of populated planets does not grow or does not grow fast enough?
> Once we scientifically solved major health issues
The two greatest health issues are senescence and limited capability of learning new things, when we solve those we'll need even more people to create art so that we don't get bored, and to develop new technologies so that we do not die when sun explodes in couple of billion years.
You say 'we' like humanity wasn't 7 billions or so completely autonomous actors.
This would be a more accurate sentence: '7 billions autonomous actors could decide to act as one, and the act could be lowering its growth rate'.
You see, it simply won't happen.
Which are mostly democracies, or sort of. China, Russia and North Korea apart, every big population center is governed in a way or another threw a certain form of consensus.
> humanity at the moment already agrees blindly that the only way forward is reckless growth
Again you talk as if humans were a single body. You're not agreeing blindly on 'reckless growth', as far as I can tell, and you're far from being alone in that case.
Humanity speaking and thinking as one is just a dream (you're free to dream, thought!).