It is very hard for most people to write effectively, unless they've dedicated conscious effort to learning to do so. We've worked with brilliant scientific and technical people who do not communicate their ideas well: https://seliger.com/2017/03/28/write-scientific-technical-gr....
It has a big focus on improv that can be distracting from the main message of the book, but I found it really insightful and had my assistant read it for discussion about how to improve communication skills and awareness.
This: https://seliger.com/2017/08/21/grant-writing-help-series-put... is about one example of effective non-fiction persuasive writing like scientific and technical grants: "Put the most important thing in the first sentence." By the way, the whole Dave Barry interview is worth reading: https://medium.com/conversations-with-tyler/tyler-cowen-dave..., although most of it doesn't seem to be immediately on topic.