You should start by building and shipping something even if it is minimal. Starting an open source project with a post calling to form a team and so on is an anti-pattern imo. Good OSS projects always should start with code from one or maybe two people that does something useful, and attract contributors from there. Just my 2c, good luck!
I agree with the GP that it's very difficult to get contributors if the project is not usable. Reading the post in reddit, it looks like just a call for help for an empty project.
But looking at the repo linked in the post https://github.com/kaveh808/kons-9 and the demo, it looks like you have something that is already working.
Also, what does this mean in the readme?
> If you're brave enough, change the pathnames in main.lisp and eval the buffer.
Another important thing to get users (and later contributor) is a complete idiot proof method to install the project and run the demo [1]. something like "git clone & make demo" or whatever is the correct syntax for that spell.
Yes I think you should spend some time cleaning up your PoC into a real, usable project. Write a nice readme, get it so anyone can run it quickly and easily, etc. In my most recent github project I released [1] I also used DALL-E to make a nice header to the README, which can also help make it feel like a solid thing to be worth checking out imo.
