Yes it is good to switch your career from QA tester to DevOps. Because the demand for cloud computing is huge in the IT market due to this reason plenty of opportunities available in all cloud computing fields. There are many ways to learn this technology but I would suggest you to go for instructor-led training for better understanding of concepts. For that I would like to suggest this DevOps Certification Training by Intellipaat which is offering the best training in the market. This training helps you to learn various concepts of DevOps and help you to become a skillful DevOps professional.
Before that have a look at this video on how Kavya upskilled her career from QA tester to DevOps field with the help of Intellipaat -