Nowadays I find that there are quite a few different ways you can get marketing, if you have a good enough alpha/playtest version that you can release (which solely relies on content at that point), you can get livestreamers (on sites like Twitch) to stream your game, or you have YouTube, etc. There is also the possibility of having a presskit or emailing journalists, there’s a ton of ways you can get your game out there, sometimes it can be a hit or miss, but gameplay and a first impression seems to be important IMO.