natures prophet.
this hero is best used as a pusher

make sure you jungle. jungle as hard as you can, but if you can push a lane
PUSH THE LANE
dont waste your time in jungle when you could be pushing.

push during team fights
push while other team is pushing
push

if you hit late game and you are STACKED go for the gank or kills.
assist your team mildy, but focus on pushing.

also it is good to have your team push while you push another lane (split push)
good luck