I'm kind of in the same place.
I know I can implement some interesting mechanics, probably, and I can write settings and characters decently, but I just can't imagine that I could come up with a good plot for a murder misery.
I was thinking a lot about how to go procedural, but it's quite overwhelming.
I'm no great artist, but I can draw some quick and effective low-res or pixel art.
If somebody wishes to collaborate or I can help them somehow, tell me :)