The best way to improve your writing is simply to keep writing. It is a good idea to keep a special file on your computer with your written work and then review it every so often so that you can see how you have improved.
Write about things you have seen, plan to do, memories, business ideas, ways you can change yourself, your home, or even the world. But keep writing!
Make sure that you check your writing by using a grammar checker software, so that any mistakes will be highlighted for you. Make sure that any mistakes are learned from so that the next time you write you won’t make those mistakes again.
This is often the hardest part of learning a language, but is the key if you want to master a language as opposed to just ‘getting by’ in it. Everyone makes some grammatical errors when writing but learning what those are can help you avoid them in the future.
Review your writing on a regular basis to see what errors have been repeated; on a positive note you will see how your writing has improved and you will be able to monitor how your command of the language is improving.
Don’t be disheartened if your grammar is poor initially as everyone had to start somewhere, the trick is to keep striving to improve and learning from your mistakes. Gradually you will find that your writing does improve and that you begin to grow in confidence as to your capabilities.