could anyone help me ?

I need any advice to improve my skill . I am normal skill player but i want to play a high skill games
my best heroes are

1-Drow ranger 145 matches , win 57.24%

2-Slarder 95 matches , win 56.84%

3-mirana 81 matches ,win 56.79%

4-gyrocopter 70 matches , win 52.86%

5-tiny 62 matches , win 59.68%

6-axe 58 matches , win 50%

7-Juggernaut 57 matches , win 59.65%

8-Necrophos 56 matches , win 60.71%

9-Dragon Knight 51 matches , win 62.75%

10-Slark 51 matches , win 49%