What to learn after these technologies?

Hi,

I'm a DE with 2 YOE + 2 YOE working as a DA. I am confident in my skills with SQL, Python, Azure, Databricks & Power BI but have next to no exposure in anything beyond that. What do you think an important concept or tool to add to this repertoire is?

I've seen job postings with Git, Terraform, Kubernetes, Airflow, Docker, Airbyte, Kafka and lots more besides, so shill me your tools!

Thanks