Unfortunately, there's no silver bullet. Writing is like coding. You get better by doing it. There are no shortcuts. Write. A. Lot.
That said, as long as you are writing a lot (and many people will read the next part and try skipping the previous one), we do have some resources that help at [0].
We also ran a writing course a few times [1]. We have no immediate plans to run another cohort - in general we got very positive feedback but participants just weren't able to commit the time to practicing, and that is really the most important part. Happy to run it again, or a version of it, if you have a few people who would find it valuable and have time to commit. Details in profile.
[0] https://ritza.co/handbook/improving-your-writing/how-do-I-be...