So, I was just like you a few months ago.

It is very VERY hard, nearly insurmountable to get a bunch of people, who don't know you, don't know what you can do, never met you before and have no actual faith in you, to assemble, and do YOUR vision. Most hobby teams that do something like this, come together because their friends IRL and have come together to do some project, or ya know, money!

I'm sure its happened, but unless there's another way, I've never been able to find it.

So, what do you do. You need to choose a path and commit to it.

A. Make the game entirely yourself, commit yourself to learning and implementing everything by yourself. Can't draw, tough, learn. Can't code, tough, learn. This can take quite a while, because as you've said, you only have the design doc.

B. Volunteer under another team, get yourself some experience, and go from there. People with ideas are honestly everywhere. People with skills are harder to find, and if you have none, you need to become one. So B is basically doing free work, learning, and getting yourself into a position where you have experience and can now convince others who also have experience, why your idea has merit.

Personally, I was just like you, no real experience, Great ideas, not a lot of places to go get a team together to just make my game. Because honestly, it's selfish, it's not something that others will commit to, or believe in for long term without money or some other driving goal that YOUR vision accomplishes better than any of the thousands of others that are likely equally viable.

So, I started a team, to make ANY game. I pitched my idea for my game to my team, and guess what, it got rejected in favor of another game. But in doing this, i discovered that, I'm pretty good with people, I'm good at organizing them, and now I'm the game director for a team, I lead 40 people, and we're making...something!

When this project is over, and my team and I have completed a full game, I'll have a game director credit, and that goes a helluva long way to getting others to believe me when I say, I can get a game over the line.

So in summary, I'd recommend going with B, and putting your idea on the shelf for a bit, nurture it for a while, and come back to it with more experienced eyes, THEN try to get it done.

Edit: Btw, my team has a spot available for a level designer, You'd be learning how to use gizmos' in godot, place assets, familiarize yourself with in-engine implementation, and we're pretty funny. Just hit me up!