The only way you're going to become fluent is to use the language with native speakers. Four hours every day is a bit too much, especially if it's not helping. You need to spend less time but spend it more efficiently.
I don't know where you live, but you really need to find some native speakers with whom to converse. That's my main problem right now, too.
Hang in there. You'll learn. It's a long road, as the various Chinese dialects are considered some of the most difficult languages to learn as a foreigner. Chinese grammar is logical and simple, but the writing system and pronunciation (tones) are challenging.
Patience. This isn't a European language where you can pick it up in a year or so. It will take much more time, but you'll be rewarded with access to literature, music, and a culture that spans millennia.
Your business?Hmmm…It means just shit to me.Because i'm not a Chinese teacher,nor am I an advertiser.So what business i can do with u?You are so ridiculous and arrogant.Before you know the truth,you'd better shut up.