so I have been approached for work on a commercial product on these very forums. things that were present in that proposal:
-indication of previous work
-up-front offer of payment for completion of work
-I was approached via DM, indicating that the team was looking at individual output and not just shotgunning offers into the void
-most of the non-level resources already existed
now, I am someone with more ambition than free time, so I get the desire for help, but you can't really get around the fact that you need to have something to show. If your big gap is mappers, then having other resources/gameplay coding complete to showcase is good. If your big gap is assets, you can always grab placeholder assets from something like OpenGameArt.org or just use dots/silhouettes, rough out some level geometry to demonstrate gameplay principles, etc.
as others have stated, a discord link isn't really going to be compelling to anyone.