Hi, welcome to the forums!
If you’ve been around IFDB for a while you’ll notice that the majority of games there are free. That’s because there’s a really small market for interactive fiction in general.
However, you may find success on Steam or Itch for selling your work for a fixed price, or even a “pay what you want” model. But if you do, make sure that you build sufficient interest, ideally with a demo or many screenshots so that a potential buyer has a clear idea of what they’re purchasing.
In terms of marketing outside the platform you’re selling on, here and the IFDB are probably good places to start. You could do an Advanced Reader Copy type thing where you send the full work to people for free in exchange for an honest review. This will get your work some momentum so people can see what others thought of your game.
I haven’t sold any games (or anything else, really), so I don’t have personal experience.
Also see this (old) thread on commercial IF.