You need to work on your grammar. Even if you ignore careless mistakes ( e.g. <em>What do you thank?</em>), there are a number of issues that need sorting.
Question forms, both simple and embedded, seems to be one area where you make mistakes:
<em>How similar I am to a native English speaker?</em>
<em>You may ask that 'What is the usage* of ..</em>
<em>A native English speaker doesn't know how does learning English as a second language feel.</em>
The third sentence is a classic non-native error which no native speaker would make. Check out 'embedded questions' in your grammar book.
Your verb+preposition use also seems erratic. For example, in your video, you says <em>I believe learning English in a practical way </em>(omitting the 'in'), but then you get this right in the next sentence you say. In your text above, you say <em>reach to a native level, </em>but then get it right a few lines down with <em>reach that level. </em>In a recent post, you wrote <em>I speak English in an advanced level.</em>
Another area to watch out for is article use e.g. <em>in [the] Persian language and literature section</em>
* Should be 'What is the use of ?' (not usage)
These might seem like minor issues, but they're things which you need to keep an eye on if you want to get to C2 level.
Here's a post you made a short while ago:
<em>Hi there American people</em>
<em>I like to know who are the most famous american poets? </em>
<em>Can you write some English poems of them over here? </em>
To be honest, this nowhere near native level. I'm sorry to disappoint you, but <em>I like to know who are the most famous american poets? </em>isn't even anywhere near advanced level. You really do need to work on your grammar.
On the plus side, however, your pronunciation is very good. You could almost pass as an American. Brush up on your grammar, and you might just make it.