It is good to hear that you are looking forward to switch your career from QA tester to DevOps field. Right now Cloud is one of the demanding technologies due to this reason DevOps has become a lucrative career for many. If you posses the required skills then anyone can switch his career into DevOps. Here are some of the skills one must know about -
Know-how of Sys Admin's work
Experienced in handling storage and network
You must know infrastructure management and compliance
Become proficient in Automation tools
Understand and gain work experience in virtualization and cloud.
Learn and implement security techniques.
Testing is an integral component that you must be efficient in.
If you are interested in pursuing a career in DevOps then I would like to suggest this DevOps Certification Training by Intelllipaat this course is specially designed in collaboration with Futureskills for everyone so anyone can learn it easily without any prior knowledge.
This training help you to learn various concepts of DevOps and to become a certified professional with all the required skills.
Along with that have a look at this video on how Intellipaat helped Kavya to switch her career from QA tester to DevOps field -