Focus, clarity, seeking for better
Recognize employees as people and not numbers. Be more transparent on the career path and the evalutation process.
Less micromanagement and pushing for crazy goals whilst not providing meaningful resources.
Talk to their direct reports, guide them, support, be available or at least answer messages. Explain properly what is needed and give the tools instead of leaving to blunder and guess. Have proper structure and decide on approach, do not change strategy every couple of weeks.
inexperienced manager HR does not care about your feedback
Treat people well. Praise more, criticise less. Train your managers to retain employees.