You can’t fix overburden while you’re overburdened

When workers complain of burnout a pet answer is work smarter not harder. It is true that we can  increase throughput to reduce overburden. What is not true is that we can increase throughput while we are in a state of overburden.
In other words until we get control over demand for work, we never have the headroom to make any improvements to be able to deal with work better.
Don’t say no to work. Learn to say “not now”. Visualise work and visualise the flow so that you can explain why. Only then can we seriously start to address improvement.