Being an arts graduate and shifting your focus towards hardware and networks was definitely a good decision as the demand of these professionals is shooting more than ever. If you want to get a certification in cloud services, then I would like you to go with Amazon AWS. AWS professionals are in very high demand right now and the demand is here to stay.

Moreover, I would suggest you to learn Docker and Kubernetes as these will also help a lot in the certifications. Hope I have answered your question. All the best!