and then choose the most appropriate and a good fit for the prevailing situation.
We cannot hide our proficiency. Native speakers appreciate at heart that we can speak many languages with equal ease. My mom spoke seven tongues in four languages and my dad spoke four languages fluently.
My mom was class five pass but spoke and wrote better than most English graduates.
So do not be cowed down. Start low and slow. Consolidate as you will move.
Learn a few new words every day. How? By finding synonyms for words we know. For example synonyms for 'write' are :
pen down
put down in writing
record
note down
2. Writing the same matter in a new way. Example: I read your note. I thank you for the same. Rewritten. I thank you for the note you sent me. Thank you for letting me know your views.
3. Revise basic rules of grammar. It helps to learn better what we already know.
4. Take to writing blogs. I think this is a great way to improve writing. I noticed phenomenal change in my wife's English by writing a 100 -200 word blogpost a day.
5. Oxford 3000 is a great way to learn the most commonly used English words. Here is what the post says about it. “The Oxford 3000 is a list of the 3000 most important words to learn in English. The keywords of the Oxford 3000 have been carefully selected by a group of language experts and experienced teachers as the words which should receive priority in vocabulary study because of their importance and usefulness.”
6. Learn / check spellings. Misspelt words can take the reader's attention away. It takes only a moment to check the spelling in an online dictionary. I use the ODE - Oxford Learner's Dictionary app.