What do you think about the size of the economy?
Do you think an economy can be too big?
For example, a person needs clothing, but does a person need to have 50, or 100 pairs of clothing?
Can't they do just as well with 10 or 20 pairs?
And what about cosmetics, cosmetic surgery, or all the 'recreational', And 'pharmaceutical' drugs people take, or all the junk food people eat, do we really need all that?
Now I'm not necessarily suggesting we regulate or prohibit every little thing we deem unnecessary (unnecessary, that is to say: commodities that're arguably not healthy, especially commodities that're both unhealthy, and take a heavy toll on the environment), but perhaps mass production at least can be regulated and significantly downscaled.
As for unemployment, this needn't be a problem, for government can nationalize the manufacture and distribution of commodities that Are necessary, such as real food/housing, furniture/appliances, and maximize employment rather than minimize it the way private business/corporations do.
And if there's still not much for people to do, perhaps they can get busy with other things, like local, small scale production, or busying themselves with health, fitness, arts, crafts, literature and philosophy, or, perhaps people don't need to be so, busy.