Robot cleaners, maintenance, etc... I highly doubt we will have a fully automated robot loop that takes care of themselves anytime soon, so there's always going to be a need for humans in the chain.
A strong argument is made that the options for new jobs are rapidly diminishing, as automation eliminates jobs by skill level, while at the same time the economy is not giving people time to retrain (people most imperilled by automation are usually those living paycheck-to-paycheck). Those two things were not simultaneously true in the past.
There will always be something to transition to. It's not because we cannot imagine it that it means there is nothing ahead of us. Like 75% of the jobs people have nowadays did not exist 100 years ago, and nobody at that time could have imagined them.
Sure, humans will go on (unless we nuke outselves), but that doesn’t mean it will be easy or fun to live through if we just presume it’ll all be fine.