Reducing overconsumption and overproduction will help a ton. We do not need nearly as much stuff as we are currently consuming. In addition, there are a lot of jobs these days that are just.. not necessary. Take advertising for example, or all the job positions that are all about how to fuck over the consumers the most, then all the energy and work into fixing it or counteracting it, everything that is done not because it's efficient, but because it's profitable
We are far far more productive today than we ever were before in human history. It's all about prioritization