Getting assistance for publishing a paper without experience I have a master’s degree in computer science. I wanted to publish my thesis as paper because I got a good grade, and I because I want to  get accepted for a PhD degree by a top-200 university or to get work as a TA at a university. 

I used existing resources and applied them on a different data set, but the results were not clear and need optimization – which will need more time (I'll do it if I have a chance to get a PhD or getting a job in this matter). 

I wrote the paper according to my naive knowledge in publishing and the whole field. My goal was not acceptance, but rather getting feedback and a taste of how things work. I sent my paper to a conference; of course it was refused. I sent it to a journal, who refused. The feedback was that my paper is a draft, has language mistakes, and most of references were old. Of course I asked my supervisor for assistance,  but things didn’t went well for many reasons. One of these reasons is that we have no clear results although the method was very good and promising on the long run. 

I was wondering if I can get assistance from other parties like doctors from other universities, but it didn't work for me. Maybe this is because I asked doctors from high-ranked universities so they may already have a heavy load. 

What should I do?
Inviting a professor with whom you don't have an established relationship to co-write a paper with you is rather futile, I think. In the first place, such people are extremely busy. Second, they don't know you and the quality of your work. Third, they don't know whether your findings are without blemish (by this I mean that the results, your analysis, the data and the methods were conducted to their satisfaction). Finally, they would wonder, as do I and I'm sure a number of us here, why you would be approaching them and not your supervisor or other teachers. Perhaps your supervisor turned you down for the reason that the work, while garnering a high score, isn't worthy of publication. This last one would be my biggest concern.

On the other hand, you might attract early-career academics hungry for an easy publication given that the thesis is already written.

Just a few things to note:


It seems to me that the rejections you've received from previous attempts have been due to language issues. In most cases, if the language of the submitted manuscript is substandard, then the paper is not sent for review. I think you should make an effort to correct the mistakes and resubmitting the manuscript. You might then be able to receive feedback about the content of the work rather than the language.
Instead of spending time finding strangers with whom to collaborate on this paper, I suggest that you resurrect the relationship you had with your supervisor.
If you do choose to try to attract strangers, be very careful about their motives and be clear about your expectations. 
You might be focusing on the wrong thing here. If your goal is entry into a PhD programme, then a publication isn't the only way you can prove your capabilities. By focusing on this, you might be neglecting other areas that require attention as, for example, bolstering your language abilities, especially if there is a language requirement that you need to hurdle.


PS. Just by-the-by, I have seen a number of such invitations on ResearchGate, which was one of the many, many reasons I've abandoned by profile. You might try your luck there, though.

Good luck to you!