My paper has been rejected again, what should I change?

Welcome to research. Trust your work and rewrite the paper. If the only problem is the English, after a few revisions the writing style should be greatly improved. Also, consider asking someone who is either fluent in English or an English teacher to proofread the paper.

Reading poorly written English is aggravating. International students get more leeway for bad grammar, with the expectation that if the science is sound, the grammar can be fixed. A rejection after a major revision means you failed to adequately respond to comments made by the reviewers. Pick a different journal and try again. Don't trust a friend to read the paper: pay a professional editor to fix the paper.

Assuming your research is solid, your arguments well-supported, and your acknowledgements presented as expected by this journal, writing style and conventions (as Alexandros and Mikey Mike suggested) may be the key. Read some articles published in this journal--any buzz words or acronyms that enjoy special favour? Is YOUR writing style too florid? Some technical and scientific journals abhor 'poetic' phrasing.