Hi there,
The key with writing is to be clear and concise. The more directly you can get your point across, the better.
1) Learn by doing. Practice makes perfect here. So, yes, writing daily will help. However, you need editing. As such, I'd recommend you try and write publicly so that you are forced to write well. Try and start a blog, or write for one (SpencerTom for example)
2) Read. Learn by "watching". I highly recommend The Economist, BCG insights, and McKinsey insights
3) Train. Learn from experts. More than happy to work with you on your business/professional writing! A few adjustments/tricks go a long way!
Q&A How to Improve Communication: https://www.preplounge.com/en/consulting-forum/how-to-improve-communication-skill-oralwriting-more-concise-to-the-point-8942
Thank you very much Ian