This is one of those instances where slow and steady wins the race. Short mods are easy to play through somewhat quickly and make a comment on. More lengthy mods, however, require more time investment for the player, and require them to take more time writing a post. That thread you mentioned had quick ignition, but will wither away very soon. Your thread will attract more quality posts (and already has), and it will last longer in the long run.
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Please stop embedding files/images from Discord. Discord has anti-hotlinking logic in place that breaks links to Discord hosted files and images when linked to from anywhere outside of Discord. There are a multitude of file/image hosting sites you can use instead.
(more info here)
If the people don't come to you, you have to go to the people :O
Even the best product in the world won't sell itself...
You put your best foot forward with the thread, but if nobody is showing up; you have to find them; or at least the ones you want opinions from.