I have solved a lot of problems say 2000 why i have not improved till now?

The number of problems solved means little. I sometimes mention it to show passion for programming (2000+ means a lot of time spent), but it says nothing about the difficulty of the problems you’ve solved.

 You have read a lot of problem statements and are should be comfortable in coding up solutions. Since you haven’t been progressing, you need to work smarter than you have till now.

 I can go to Codeforces or another online judge and solve a few hundred Div2-like problems in little time. Yet, I won’t learn anything.

 By now, you must know the kinds of problems you struggle with. You need to work on those. Since you’re not in Div1, my guess is that you’re not consistently solving Div2D and E problems. Focus on them. Then, move up to Div1 up to problem C.

 When you struggle with a problem, say graph theory, try to study up the theory behind the key ideas and consolidate your knowledge and understanding of it.

 Qualifying for ICPC WF is much trickier. Some regionals are way easier than others. It really depends on where you study. It also depends on whether you can get good team mates or not.

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