... rpi kubernetes cluster for a few hundred bucks. You can run hadoop or spark or hbase or mesos on a cloud provider. Learn ansible, prometheus, go, python or loads of other things in your browser. You can show off your skills outside your job on github or bitbucket
100% buzzword compliant. You list products that are 2 years old.
Which brings up the old joke about HR looking for someone with 10 years experience in X which has only been out for 5 years.
Yes, you can PLAY with all of those for very little money but you won't KNOW all of those. You will be a dilettante. And swapping out existing tools for whatever was released 2 years ago is a recipe for disaster.