The skill of decision making is often overlooked when someone looks over their skillset.
The decisions you have made have led you to where you are. If you are for the most part happy, then your skills for decision making are finely tuned. If you are mostly unhappy and possibly bitter, then you need to work on this skill.
Making decisions is easy, making the right decisions is not so easy. When decisions arise, taking the time to weigh the options and potential outcome is the beginning of sharpening this skill.
Often, people who make mostly bad decisions don’t think, they react. Stop reacting and start thinking, and this may lead to better decisions and more skilled at decision-making.