First of all, you should write a good abstract which provides an idea of why the original research your paper is based upon provides an added value to the conference.
Respect the following:
a) verifying if your topic really fits the call for papers;
b) limiting yourself to the word count that is indicated by the organisers;
c) following the instructions on how to format the proposal;
d) including all the additional information required (such as basic personal data, keywords, exact level of study, etc.);
e) writing a text in correct English syntax and spelling;
f) keeping to the deadline.Too similar to another already accepted