You will find some recommendations in these discussions:

https://www.researchgate.net/post/Some_writing_tools_resources_for_research_students/1

https://www.researchgate.net/post/How_to_become_good_at_academic_research_writing/1

https://www.researchgate.net/post/How_we_can_improve_our_scientific_writing_skills/1

https://www.researchgate.net/post/How_can_you_develop_your_writing_skills/1

https://www.researchgate.net/post/How_can_we_develop_writing_skills/1