If most of your time is occupied by Chinese, your brain does not have enough space for English.

To improve pronunciation, a good way is to record your reading. It doesn't need to be long, one minute is enough. After that, you replay it, and find out which words you don't pronounce correctly. Your kids may help on this part.

The English version of Rolia Forum can be helpful on your reading and writing. If you are willing, I can correct some of your writing mistakes after you post something there.