People have a common mindset that we have to very self-concern about our growth and development to be successful. You will see many people who don't feel the urge to help others. And the reason behind such behavior is they think helping others will help others to climb the leader before them. But is that true?
Selfishness should be a natural virtue but unfortunately we forget to practice it. We first have to understand that helping others doesn't make us fail. It doesn't make our path hard or it doesn't work as a barrier. But if you take an example from your personal life, you will notice how opposite people actually behave.
Change your perspective this way- 'You are giving others because that is what they supposed to get.' We can't control many things. And maybe if we don't help, people will get help from other sources. They will find their path in another way. We can't let them down by not helping. So there's no reason to be selfish.
You can relate it to your personal or professional life. Especially in many corporate sectors selfishness works as a ladder of success. But at the end of the day, selfish people increase their stress, anxiety by making strategy on how to pull back others. You see, how toxic this is. Though we think it's okay to be selfish in different situations. But in reality selfishness actually makes us fragile.
It's better to be selfless because it gives us more time to focus on our own goal rather thinking about others. Also, it helps us to stay away from toxic comparison. This is how a selfless character can be more successful than others. Maybe not in terms of financial benefit but mentally for sure!