LOL! I don't find projects, they find me!
In all seriousness though, I didn't fall into something that sparked my passion, I just HAVE a lot of passion and I'm constantly engaging it in so many ways, and one day I'll read something or watch a show, or just be passively thinking and my brain will go "I COULD DO THAT!"
I mean, that's basically my secret. I'm constantly exploring the world through people and media and my automatic reaction to hearing about anything interesting is to imagine myself doing it, and if that sparks anything in me, I start researching what it would take to do it. I basically ALWAYS try to imagine myself doing whatever it is that I'm exposed to. I was sick on vacation and watching a Chinese news station I had never seen before, and a special on the economic interests of various countries in the arctic. I thought it was interesting because Canada and Denmark are two of the players and I'm a Canadian and my family is from Denmark.
So I read more about the arctic, because the second I find something interesting, I read more. That lead me down a fucking rabbit hole of learning about norther Indigenous communities. I immediately imagined myself there, and that felt so interesting. I read voraciously, read blogs about people who had moved there, talked with a bunch of people about it, mostly online.
Anyhoo, I've made tons of connections, learned an enormous amount about the region and it's challenges, figured out what value I could offer, and basically have an open ended opportunity to be flown up there for a month or so to do some very valuable and interesting work. While I'm up there, I'm sure I'll fall down more rabbit holes of cool stuff to become fascinated by and involved in.
That's just one small thing that caught my attention and turned into real life opportunities.
But that's how I approach everything. If someone tells me about their job and it sounds interesting, I contemplate doing it myself or doing some work connected to it. I probably won't, but my immediate reflex is "Ooh, I wonder if I want to do that". If I see something in the world that I'm not okay with, I immediately start thinking about how I might contribute to making it better, and if I don't have the skills or ability to do so, I contemplate what skills and ability I would need to be able to.
There's literally nothing I encounter that's even remotely interesting that I don't contemplate becoming a part of somehow. 99% of them I'll pass on, but it's never automatically dismissed as out of the question.
I think that's the big difference. I don't put myself in a box of who I am or what my life is. I constantly can be and can do all sorts of things, I just choose not to.
So for me, the world is a constant stream of exciting options perpetually slapping me in the face and screaming to be considered. I don't go looking for them, I can't avoid them. Every tv show, every book, every conversation, every interaction with the world shows me possibilities of things I could be part of and almost all of them are interesting.
The limiting factor is my capacity. That's all.
So no, I was not inspired to do one big thing. I'm inspired to do several hundred big things, there's just one big one that I definitely have the capacity for, that I think may be the best use of my bandwidth for the opportunities it will give me.
I guess my only advice is to start imagining yourself in more dynamic ways. Take the boundaries off of who you think you are as a person and what you think your life is. Maybe you're an introvert who likes gardening. Maybe you're also a person who gets really into epic hikes, and falls in love with natural wonders, and then becomes inspired to get involved in conservation. I don't know, but neither do you.
You can't know unless you open yourself up to what's out there. I could never have predicted some of the things along the way that have captivated me. It always seems to come out of left field.
The best way I can describe it is that when I love things, it's easy to want to do meaningful work related to those things. And I am supremely open to falling in love with new things all the time. The world is a vast place with astronomical possibilities, but most people live in very tiny spaces and think that's the world.
If you aren't finding yourself inspired, then you are living in too small a space.