Need suggestion on what to learn for career progression

I am an Java + Angular SDE with around 6.5 years of experience. I had worked majorly on Spring boot rest API development and angular and Blockchain in my early career.

I have some experience in AWS and openshift for cloud. I want to learn something new , preferably not in data space as I am not interested in it.

Can someone suggest me what can I learn which would be an addition to my existing skill set, say something like graphql ..

Thanks in advance