I think you are on the right path to want to improve yourself and the right way is definitely to become more self aware.
Do you work? Does your work have any schemes or personal development or coaching? Do you have appraisals? Can you ask for feedback from some trusted colleagues in the form of : what should I stop doing, what should I start doing and what should I continue doing?
If you don't work, do you have any friends or family who you can ask for feedback from? Be careful who you ask as this is not an opportunity for people to but pick, you need to be confident that they have your best interest at heart.
If you're not keen on that, try thinking of a few scenarios from your life. One that went really well- where you're proud/ pleased with the outcome. And a second scenario where it didn't go the way you wanted.
With scenario one: write down what happened that you're proud of ie. I redecorated the spare room in time within budget, or I was asked to help with something at my kids' school and I did it really well, or I got on the housing ladder by buying a house... Anything that was positive and beneficial and that your are proud of.
Once you have your example, start to break down HOW you did it. Were you organised, persistent, did you use your strong relationship skills, have to work hard and be dedicated, did you have to influence people, delegate, communicate clearly... Etc.
Once you have your list of how you did it, think of what skills YOU innately have in yourself that allowed you to do tear things. Eg if you said 'I'm usually really bad with money but I redecorated my spare room and stuck to a budget. I did this by calling up friends who I know are in the decorating industry and asking their advice. They recommended a carpet man who was cheap but difficult to pin down. I rang him consistently until he committed to a time.' I would say that shows that you create strong relationships where people trust you. You are also consistent, focused and good at holding others accountable.
Don't be modest, be factual and rational.
Then do the same with something that wet wrong/ not as you wanted.
Do more examples from what went well than went wrong.
Have a go on this threa if you'd like my perspective!