Can anybody help a 1630mmr scrub get better?

i'm a decent player for where i'm at and would like to improve and reach at least 2k anybody have any tips?

I have a great attitude and people like to play with me

I would like to know more what to do and how to do it better so i can leave 1k scrub level

http://www.dotabuff.com/players/148973173

Edit: also is there any hero I should spam? I've currently been playing omniknight and am 7/8 wins with him