You absolutely can specialize, you can even describe your current role in a way that sounds specialized - "Build/Release Engineer specializing in CI/CD and clou

You absolutely can specialize, you can even describe your current role in a way that sounds specialized - "Build/Release Engineer specializing in CI/CD and cloud native technologies." As far as specialties inside DevOps - security, OCI, schedulers are general areas that have specialist roles available. Another option is to specialize in a tool or tooling ecosystem relevant to DevOps. For example, you could decide to learn AWS service offerings inside and out or specialize in webtech on bare metal and land a role at a company that has the scale to demand optimal bare metal deployments.