I think going for cloud computing would be a better idea. System testing is also a really good field but honestly with growing demand for cloud providers and cloud experts I see a higher growth there.
Talking about career path to becoming a Cloud Computing, taking up a course would be the best option to boost up your chnaces getting into a company. If not a course you could learn as all the resources are available on the internet starting from documentation to YouTube videos with step by step explanation.
All the best :)
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