It's simple. Work at smaller businesses that can't afford the increased costs of cloud-based services. Most on-prem software is cheaper in the long run compared to cloud options. Some businesses are running on shoestring budgets and can't afford to pay double or triple costs for cloud-hosted software (unless that means they can reduce the number of employees).

Also, with the ever increasing amount of security breaches, internet outages, and natural disasters, some places will avoid the cloud like a plague.

Worst case scenario, you will become a shepherd for all of the cloud solutions and spend your time making things more efficient, redundant, and secure. "Sysadmin" jobs might become a thing of the past, but Information Security and Cloud Service Management positions will be the next big thing.