You can completely relate this sine wave with your whole life. Very first thing that come up in this sine wave is that It always start from Zero. This means, all the lives start from Zero and it's true.
You need one positive thing. It may be Self-love or it may be Positivity. If you have one, then you have the second one too, and all the good virtues of the world. Because the positive rings are connected in a chain. All the positivity comes under the sky of Love and everyone has at least one good virtue.
According to nature, If there's one thing is present, then the other is absent. If there's light, there's no dark. Only one thing can be present in a particular place. Either you are Narcissist or extremely negative person about yourself (Both are same) or you love yourself completely. One thing is present in you and one is absent. But the Focus inside you remains the same.
Positivity and Egotism are similar to Self-love and Narcissism respectively to some extent. In Self-love, we are Positive about ourselves and the actions we commit. While being Narcissist is common as Egotistical.
The matter is all about execution. If you want a change, you have to execute. You have to work on it. You have to reflect on what is being said and if you want to transfer your light to the others, then remember one thing: Reflect before asking others.