I've been preaching this for a while now in this thread. If you're trying to make a career out of this, or if you're on your way up and trying to get an edge over the competition, cloud + automation is the fastest route.
Cloud + Linux + Some scripting language(python/go/node)
Cloud + Network + Security + Some scripting language(python/go/node)
Cloud + Containers + Some scripting language(python/go/node)
Any combo of the above will have you eating for a while.
If you wanna make stupid money, learn iac tooling and couple them with the above skillsets to create, manage and scale highly available infrastructure:
Terraform/Pulumi, ansible/saltstack, CI/CD(gitlab/jenkins), basic version control with Git, and Kubernetes. This may seem overwhelming at first, but you're not gonna learn all of this at once and you don't need to learn all of it. It's a natural evolution to your cloud/infra workflow... once you've gotten comfortable enough with cloud infra, clicked around the gui a few times and you find yourself repeating the same tasks over and over, you're gonna find it annoying and ask yourself.. how do I make this faster? That's where these tools come in.
Also.. I see a lot of people get overwhelmed by coding portion like you need to be a full stack developer to begin to automate stuff. You really don't need to go that deep.. just learn basic data structures, dataflow, loops and error handling and you're off to the races. You can start automating shyt within a few days of going through a python course. The most important thing is having a high level overview of what you're trying to accomplish, what pieces you're trying to tie together and how they integrate with your code. Also, don't think you need to write 1000s of lines of code before it's considered automation. You can automate lots of shyt and save a ton of time with just 10-20 lines of code. It all depends on what you're trying to do.