Another place to promote your game is LewdCorner.
You can make a video for it on LBRY/Odessy, even if it has adult content. Another idea of promoting your game is that you could put official game cg on the anime image boards (boorus), like Gelbooru to promote your game.
As for what happened to MDRG, that was wrong on Steam's part and that made Steam look bad again. Wither they realize it or not.