mostly breathing. sometimes pizza.

Several answers depending on point of view and expected response to satisfy the question.

1. We exist on Earth because we are not martians on mars.

Purpose defined as the reason for which something is done or created or for which something exists.
2. The reason you exist is because of what your parents did.

Unless, you think you asked to exist, it was all about the non-existent flying spaghetti monster sky God that did not want you to remain in non-existance with the non-existent flying spaghetti monster sky God. So, the purpose of existance is so that you are not non-existent. The sooner we can get everything back to non-existance with the non-existent flying spaghetti monster sky God, the sooner we will no longer have to worry about existence.

Tiger food.

That is entirely up to you….we have the power within us to give meaning and purpose to our own lives. Make the most of that power and don’t give it up to someone else to decide for you.

The species supposedly all balance each other to make a cohesive system. Unfortunately, mankind has outgrown its original “place” and is ruining the planet by making an artificial imbalance in the ecosystem. So NOW, we could DECIDE to save the planet, but we likely will do nothing and ensure our extinction…and consequently nature will “reset” without us.

Personally, I get the greatest reward from doing work that helps other people. This includes volunteer work.

Since 2006 as a volunteer, I have been helping first generation students (children of immigrants) write essays for college and scholarship applications. One of my best success stories is Brenda, who won $269,445 in scholarships in 2016.

I want to leave the environment cleaner than I found it by cleaning up litter.

Becoming a better person: working on listening more and being less judgmental.

Purpose is an illusion.
Civilizations fall when to many are burdened with glorious purpose.

Human existence has no inherent purpose. It came into being as a chance occurrence. In terms of the universe, we are a miniscule transitory blip on the radar screen of reality. ,

[merriam-webster.com]

This implies (by definitition) that our very existance was intended. So....
Go ask your parents if you were a planned baby. If not, you have no purpose. If so, your "purpose" had nothing to do with the random egg/sperm combo that resulted, and in any case, your hypothetical purpose, at best, is past tense.

Having said that, YOU can give your life meaning, just not purpose, technically speaking. If you are asking US to tell you, you are on the wrong path.

Cheers!

Nope

What is purpose?

I spent many years asking this question until I finally realized that to do so was a psychological vestige of my days as a believer, living in a universe that was ‘made just for us.’ Such egocentric hubris! Why must there be a purpose in the first place? The very question admits of a narcissism that we self absorbed Homo sapiens have yet to outgrow. I’m reminded of a song by my favorite band:

Why are we here?
Because we're here
Roll the bones
Roll the bones
Why does it happen?
Because it happens
Roll the bones
Roll the bones
—Rush

There's not going to be any collective answer to that since we didn't all get together and decide what our purpose was. So it's going to be individual and therefore there's as many purposes as there are people. An outside observer might think it's to see how fast we can destroy the planet

Nope, I'm pretty sure that there is no purpose. And that's just fine with me.

Sure. I got it all figured out. We are here to look around, enjoy ourselves and try to not fuck up the planet.

Cosmically speaking, there is no purpose. The universe does not care whether there is an earth, or that there is life on it.
Evolutionarily speaking, here on earth, where life as we know it evolved, the purpose is to live long enough to procreate.

Camus

You make your own purpose for being here. You got here because you had parents.

There is none.

I'm pretty sure my purpose is to annoy as many people on the right as I can regardless of race, nationality, or religion.