You should first work on not dropping pieces, missing simple tactics, and avoiding back rank mates.
Then you should forget about titles like "agressive" and "passive"
Follow that up with tactics...tactics...tactics...and...Opening Principles:
Control the center
Develop minor pieces toward the center
Castle
Connect your rooks
Ever since starting playing chess, I have always played 1. d4 and gone for a peaceful slav or QGD exchange variation. After doing a fair bit of self study, I was able to get to an (in my opinion) decent rating of 1398 for a 13 y/o boy. But after playing a few competitive tournaments, I have noticed the following points about my play style:
After noticing the following things about my play, I decided that I will need to reboot; that is, to start learning chess from the beginning as many people have said that I am wasting my talent to be playing defensive or passive chess at such a young age.
How should I go about starting with chess again, so as to get some intuition for attacking and/or some reasonable ability to play aggressively?