> The only thing you need is to stop this idea that living a richer life means earning/spending a lot of money / reaources. There's so much personal development you can do without participating in the materialistic rat race.

If you launch projects to gain fame, sure it is materialistic. But you can work on projects that help you understand things better, or to build the personality you want to have, both of which are the opposite of materialism.

They aren't egoistic as well, because you can then share your solutions with others, which are also going to benefit from it.