In fact, lack of proficiency in English, in particular reading and writing skills are big barriers for your contribution in the forum, which has most of its serious boards designed for only English discussions.
I am a non native English speaker too but its not a hindrance for me to express my thoughts.
That's it. Reading more to get more knowledge about crypto world. Of course, should choose good topics to read in order to save your precious time.
And there are lots of useful, informative sources in the Internet to read and get knowledge.
Try to read more and it will enhance your vocabulary.
Not enough!
Writing good threads requires knowledge, time, English skills. And most importantly, constructive threads are only considered by other members of the forum as real constructive threads when it published in relevant, in-contexts. If your threads are constructives, high quality, but someone gives almost the same answers before yours. Consequently, your threads will automatically become un-constructive, or -unhelpful threads.
And try to be constructive and informative to avoid being accused as spammer.
Good luck mate.