Approach adviser to help publish a paper/Journal
Two approaches:


You could say, "I think it would be a good idea to convert my thesis work into a journal paper. What do you think?"
Write up a version of the to-be-journal submission, present it to your supervisor, and ask "Do you think we could submit this, after some revision, to a journal?"


In any case, it sounds like you need to start being the master of your own destiny, and rely less on your supervisor. It is your masters' thesis after all, and your research.