That's what every creator on itch.io would like to know, but there's no easy answer. It takes work, patience and luck. You just published your third game less than a day ago. Give it time. And do some promotion work. Have a website. Use social media. But mostly talk to people like I already told you.
I guess in practical terms your best bet might be attracting youtubers and other streamers to play your game. But honestly you are doing rather good, considering just how much horror games are released every month. There is some kind of critical point where streamers would seek out your game to get popular. You can see that happening in comment sections of page 1 games. And you are already on page 2 - of the 30 days segment at least.
hey, did my game got featured for few mins?