11 years software Experience: Should I learn C++ or JAVA in advance?

I have around 11 years of software and data engineering experience. Currently, working in one good investment firm as senior engineer. Main expertise is Python. with touch up knowledge of JAVA, .Net and SCALA.

Need your kind help over should I learn JAVA or C++ in advance, I have no target in mind just better understanding of whole programming language flow.

I have done my engineering in electronics and communication so I still lack basics of computers like deep knowledge of algorithms and DS.