Why do some people manifest, and why some don't?

I've been diving into the world of manifestation lately, and it's fascinating to see how some people seem to effortlessly attract their desires while others struggle. Even though they might be trying to manifest the same thing? What do you think are the key factors that differentiate those who successfully manifest from those who don't? Is it simply a matter of belief and mindset? Or are there specific techniques and practices that make a significant difference? I'd love to hear your thoughts and experiences on this topic.