Love Delphina's breakdown of tips and suggestions!
I'll reflect a little from my personal experience. Your post made me think of something I wrote in response to a friend, shortly after I started working on my webcomic Now Recharging. It's a bit more from the sense of "how do you know what you're working on is worthwhile" but there's a lot of overlapping sentiments on finding your way with a project and letting it out into the world. In case it's helpful:
https://maiji.tumblr.com/post/144452495784/yuhiurameshi-how-the-hell-do-you-know-that-the
Back when I posted that, I had just started Now Recharging for a few months (around half a year, I think). I'm now looking back at that post around 7 years later with a finished webcomic of over 500 pages. It's not perfect, but I learned a lot working on it, and I did it, and it's out there!
There's this old story I remember reading when I was a kid - "throw your hat over the fence". The gist is that if you come across a fence you want to get around, throw your hat over it. Then you'll have to figure out a way to get around the fence. In other words, do one thing that is a step you can't backtrack on, so that you need to figure out and take the next steps.
For me this meant that, once I figured out "just enough" to be able to start drawing actual pages (e.g., knew who the main character was, their name, their situation, what they and their world generally looks like), I started posting them publicly. This started to make the entire project real, and then other things started getting more real more quickly, and then I had other problems and questions I had to solve, and I would figure it out as I went along. I didn't really have a strong sense of "direction" aside from an overarching mood and theme, and I figured I would figure it out and not sweat too much over planning everything down to the nines (is that the right saying? lol) before I start.
Now, this was more feasible because of the nature of the story I was crafting over time - episode slice-of-life that gradually reveals a bigger cohesive theme. I talk a bit more about this in this post, under the last section "Commitment over time".
https://nowrecharging.com/comic/behind-the-scenes-the-process-behind-now-recharging/ This is an approach I felt a little more comfortable in because I had been unknowingly developing experience with it over many years... in fanworks! Over a lengthy period of time before I started working on Now Recharging, when I was writing fanfiction and drawing fancomics, I had this approach in my work where I really enjoyed planting little seeds of things in stories without having a clear sense of what they might be used for, but then later being able to build on them and expand them into other things, and continuing to build and build and grow a world organically. And that I enjoyed creating short little pieces that, in retrospect, can be strung together to create a bigger experience.
I'm sure you know this already, but a reminder when it comes to creative work (and lots of other things to be honest...) - don't treat anything as gospel! If it works for you, it works. If it doesn't work for you, it doesn't work. The above is what worked for me. Try whatever resonates, and if it doesn't work out, there are many other things to try! There's no one way for anyone... and that includes yourself. Sometimes it may just be where you are at a certain point in your life, and how an idea or approach is presented, how it hits you and suddenly makes more sense than it did the 5, 10, 50 times you saw it before. We're always changing as people, we can come back to things we've come across before and see them in a new light with a new understanding. I don't believe I could have created what I create today ten years ago, without the experiences I had leading up to wherever I am today.
I hope this helps, and I wish you well on your wonder-ful creative journey!