Any recommendations to improve my agressive playstyle?

I'm 1100 elo right now, and I'm pretty decent playing defensive, booming in castle age and closing the games in early imperial, but every time that I try to go all in in castle age with knights or archers, or wathever, I end up losing the games, I think is because I don't know how to close the games properly, and I think is really important because the higher I get, most people start to play really agressive in early castle and I just can't follow them