What are some ways you’ve improved the productivity of your software development team? What do you think are the most impactful steps leaders can take to help devs optimize their workflows and improve their efficiency?

I consider AI tools to be the quick fix and I prioritize them in this order:
1. Pull Request (PR) review tool.  
2. Coding assist tool, e.g., Cursor, GitHub CoPilot, or Codeium
3. Text to code tool

In my experience, streamlining software builds and deployments—to the point of full-automation—is the most impactful way to boost a development team's productivity.

Foster Work from Office culture
Build best practices guide (technical and non-technical)
Give new joinees couple of weeks to get used to culture, best practices
Create slack channel dedicated to problems being faced by team members.

I am sure there would be other good suggestions also.

We are creating and leveraging development platforms that automate much of the mundane work such as deployment pipelines, infrastructure provisioning using IaC, etc.