Constant reading of scientific articles and books that deal with your field of study, as well as constant practice in writing. It is a progressive process as long as you are willing. Everything is in your interest and your good work.
One of the things that really helped me is to read several good quality papers from your field and carefully analyze their structure, writing style etc.
1. Find papers published in your field in quality journals (e.g., look at the quartile of the journal: Q1, Q2, Q3, etc.).
2. Examine the structures of the papers you found (e.g., titles, subtitles, average wordcounts of each section in the paper, etc) and prepare an outline for your future paper structure.
3. Then, analyze the structure and content of each paragraph and sentence in each section in the paper (e.g., paragraphs and sentences in the introduction section, etc.) and take notes about them that will help you in beginning to write.
In brief, analyze good papers from whole to piece, create a paper outline for your future paper, and regularly update and use it.
Constant reading of scientific articles and books that deal with your field of study, as well as constant practice in writing. It is a progressive process as long as you are willing. Everything is in your interest and your good work.
Writing as modeling is what makes poor writers into great writers in an instant. What does writing modeling look like? Copy a paper and follow the structure. If you want, you can even follow the sentence structure. All ideas are your own, but you follow the model so you will never be stuck.
Here is an example of a sentence:
"There is a paucity of research about research gap analysis, there is hardly any study which has conceptualized the research gap analysis based on certain dimensions and propositions." (Farooq, 2018, pp. 71, " A Framework for Identifying Research Gap in Social Sciences: Evidence from the Past," available on Researchgate.)
My model: I am writing about reflections in education, purely hypothetical for this example:
There is a lack of research about the effectiveness of reflections in education, and few studies demonstrate results which can be generalized to other situations and settings.
Notice, in my example, the semantic structure was utilized, but all the ideas are mine. Like Kamal M Alsaad stated, one must still have good ideas clearly presented. Others are helpful, too, such as reading and learning the field, but pay attention the headings & subheadings, sentence length/structure, types of paragraphs, and number of references. Follow a model when in doubt!
Finally, novice researchers often do not take the criticism from mentors and reviewers. If you are told to do something, do it!