How to best start a self enworsement journey

Go read Invisible Monsters, by Chuck Palahniuk. That's essentially what the entire book is about.

Find the thing you're scared of, the worst idea you can think of. Then do it

1. Eat more fast food
2. Take drugs you know are bad for you
3. Never sleep unless your body forces you to
4. Listen to conservative media and YouTube conspiracy theories on a continuous loop
5. Assume you know best in every situation
6. Make sure everyone else knows how stupid they are

You should damage your ventromedial prefrontal cortex. This will make you less empathic and more impulsive. It should be easy to do by drilling into your forehead.

Drugs! Nothing like an addiction to really make things bad!

Your first step is to become older than 25.
After that, you're on your way to your 60-year long self enworsement journey!
That is if you live that long..
Enjoy!

I'd suggest arguing with people online as often as possible.