The problem is not your writing style, it is your writing itself. Your English is not up to scratch. From the original question you wrote, first two paragraphs:
I have submitted my manuscript to a reputable journal and I had received rejection as the the file didnot pass the grammar test in addition to the quality of the figures.
To be honest, I have never get a help from my supervisor either in master or ex-PI during the first year of PhD to write in a scientific manner, although I was reading many times, but I feel yet not confident.
I highlighted issues with your text:
- duplicated 'the'
- 'didnot' should obviously be 'did not'.
- it's clear from the context that "in addition to the quality of the figures" actually means "in addition, the quality of the figures was not sufficient". But it's bad writing regardless since the entire sentence needs to be read before the phrase gives the right meaning (without the context it actually implies the figures are of high quality).
- you cannot get 'a help'. You get 'help'.
- 'in master' should be 'during my masters'; 'ex-PI' presumably not necessary since during the first year of your PhD your ex-PI is probably your supervisor also, i.e. write "... from my supervisor either during my masters or first year of PhD".
- past continuous tense is clearly inappropriate, use present perfect: "although I have read many papers".
- "yet not confident" is artistic writing appropriate in poetry and such but not in scientific writing: "...but I do not feel confident yet".
There's no easy solution to this; you'll simply have to learn English better. If your institution offers classes in English or assistance with writing, utilize those. Otherwise, you will probably have to self-educate, with books on English grammar.