I found 10 years back that getting into C++ jobs that would give you valuable experience were the ones that already required you to have that experience, or have very good connections. The ones that were easier to get into were the C-with-classes balls of mud that only were written in the first place because they were early for Enterprise Java to be invented, I doubted that entering from the latter would give you a pathway to the former.
I decided it wasn't worth pursuing, went from doing Clojure to Big Data in Scala.
Ten years later, I hear that there's not enough "C++ developers", read, "C++ developers with the desired qualifications". Seems straightforward to figure out why.