Use one subject per email thread with a good subject line.
Keep it short. Five sentences or fewer usually works. For longer emails, consider writing your email like an Axios article or putting the bottom line up front.
Learn better ways to express reoccurring needs.
Share documents and other files with a link to the cloud. For a free, no-registration option, pCloud Transfer works.
Use email when may need to find your message in the future or when formatting helps clarify your message. Again, see Axios.
Don’t email when you should call or text.