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On a job seeking perspective, you better ask the other way round: What problems am I capable to solve?
https://www.sololearn.com/post/69481/?ref=app
https://www.sololearn.com/post/77107/?ref=app
https://www.sololearn.com/post/77277/?ref=app
Apart from learning new languages, you will also need to go deep in the languages you know by :
(i) Learning algorithm.
https://www.sololearn.com/learn/774/?ref=app
(ii) Practicing OOP heavily.
https://www.sololearn.com/learn/CPlusPlus/1710/
https://www.sololearn.com/learn/Java/2151/
I suggest you to begin with defining class for complex number as practice.
https://www.sololearn.com/learn/4665/?ref=app