Of the people who try to improve themselves, many try to make drastic changes overnight, and this tends to not last long. What if you made a choice to improve a very small amount each day? Over the course of a year this would amount to massive improvements to your life, and it would be more sustainable than a overnight change.
Many people are being taught that they need expensive mentors, time-wasting mentorship programs, and other things that only benefit the promoter. There is an easy and inexpensive way to get the best minds and the most wisdom of humanity through virtual mentorship via books.
Too many believe that they have to learn through making their own mistakes. While we can certainly learn from the mistakes we make, and we should learn from them, it is ideal to learn from the mistakes others have already made. You can then choose to do things differently from those who have made mistakes and thus limit the amount of mistakes you might make.
Mediocrity is often accepted because people compare themselves with others, but the successful person should be comparing themselves with themselves. Have they improved upon themselves or had a regression to the mean? In the end, mediocrity is nothing more than failure.
Many people make all kinds of progress, only to make one big decision that undoes or destroys all the progress they made. This self-sabotage is generally due to self-limiting beliefs that keep you restricted to mediocrity.