How to benefit from unsubmitted thesis?
If the research is of sufficient quality, you can write papers and submit them for publication in peer-reviewed journals / conferences.

Check to see if your institution has specific rules about publishing material from a thesis.  Also, if your advisor or any other person made significant intellectual contributions to the work in the thesis, they may be entitled to co-authorship and you'll need their approval before submitting any papers.  (It is probably a good idea to consult with them anyway about whether the work is of appropriate quality, and what revisions should be made before publishing.)