Get a few streamers that have an audience to play it.
I do a lot of content: YouTube, TikTok, Udemy, which all have their own algos and search functionality.
...and Blogs ( which is picked up via Google Search)
Another way someone told me is to promote things in the forum comments, like this website I hosted using esp32. I am posting here: https://esp.khalsalabs.com
For few days I will test commenting method (until this goes down due to traffic flood)
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I never tried, but I read/heard FB, Xitter and YT also could help spread the word. But it implies you to be active in the community, by posting updates, fixes, news et al about your game constantly, and keeping people updated.