What should I do after completed my all courses on sololearn?

Answer 1

see answers of this post
//lots of sites to practice and master
https://www.sololearn.com/Discuss/437973/?ref=app

Answer 2

well you can apply for job if you are not intrested to decorate the walls with your certificates

Answer 3

Further deepen your knowledge in the languages with books, videos and any other thing that helps you understand it better. (W3 Schools is great). Then you can get qualification s.