People see your language as a reflection of your competence. Make lots of writing mistakes, and you’ll come across as uneducated and uninformed. But it’s probably been a long time since you learned about dangling participles and parts of speech in school. So take it upon yourself to brush up on the rules.
Consult guides on grammar and usage, such as Strunk and White’s Elements of Style. Ask knowledgeable colleagues to proofread your material and to explain their corrections. Pay attention to what talented writers inside and outside the organization do.
Read first-rate nonfiction, which will help you cultivate an appreciation of the skills you’re trying to acquire.