Yes, it's absolutely true that it's hard to get any interest. I think I've made a few fun games, but they're all spectacular failures in terms of promotion and getting attention. If you're not constantly promoting, the plays dry up - I think that only a tiny fraction of all games on itch.io get natural, sustained attention (from word of mouth, being featured on the front page or being on top of the "most popular" search lists). Even if people play your game, there's only a small fraction of them that will leave a comment, rating or review...
If you have fancy graphics or a unique, catchy gimmick as main selling point, you might have a chance with your promotion efforts, but if your main selling point is deep and interesting gameplay... well good luck with that.
What's worse: you made a multiplayer-only game. That's just not feasible as an indie. Make sure your game can at least be tried in single player mode, for instance by adding AI (it doesn't matter whether it's truly smart).
All my games here except one are multiplayer (local or online), but I've been trying to make sure they're (nearly) all playable in single player mode, even if that's a lot less fun: either by adding AI opponents (competitive games), or by allowing players to control multiple characters (coop games). For the online multiplayer games, I have no illusions; I'm not even hosting a server. If you want to play them, you need to run your own server. I mainly made those games to play with my friends during lockdown. :-)
That said, your game looks quite interesting. I just haven't been able to play it yet (because of the multiplayer). Make sure to market this to board game fans, like the people who play on www.yucata.de or en.boardgamearena.com - that's quite a different audience than typical video game players, especially here on itch.io (it seems horror, visual novel and simple arcade games dominate here).