The biggest opportunity in this life is to fight this two aspects;
1.Self doubt
2.Laziness
All of us can improve our impact and results,its how you keep fighting the above two in your mind,body and soul.
To fight self doubt; read more self help books,blogs,articles etc. Become an avid reader.More so, improve you skills every year – say Leadership,Advanced Excel,Communication etc
On laziness;this is on all of us even the founders of Google and Amazon.The above still helps to fight laziness plus you could add the following; have your goals but break them to daily tasks,weekly and monthly.A daily to do list works wonder for me..yes Daily to do list,if possible please create this an evening before the next day.In addition,read books of people who have done what you want to achieve..Success in anything is neither magic or luck;persistence is the key!
There you go,aim to fight your self doubt and laziness daily.