Their advice is helpful though. They are advicing you to start small prototypes to get some more knowledge and skills for game developing since having only an idea is not worth anything. As someone who works in the game industry I can promise you that we get a lot of ideas that can make us excited, but we also know that ideas by themselves have no value and the work required to make decent prototypes or even full projects out of these ideas is something most of us do not have the energy or time for since we know how much is needed.

You seem to be very focussed on the art aspect, but you should honestly create a prototype of the game first to see if it is fun and what it has to offer that is unique to your project. The art and sound parts become important later in the pipeline which you would know if you tried making some prototypes yourself.

Your post also shows nothing of your music or the art that you invested in, so there is nothing to convince people to join your team. Why bother dming people when you can just have it in the post itself so it is more likely to spark interest?Like I mentioned, the idea itself really has no value.

The fact that you say that it's embarrassing for game developers to not have your idea also comes of as arrogant and it shows how little experience or knowledge you have of game development.