Steam is a different beast. It's basically just like itch.io, but much much bigger. Steam has its own algorithm and product placement tools that put your games in front of players. Just having an appealing Steam page helps so much.
Outside of that, you're looking at the same funnels that go to itch.io. You send the Steam page to streamers, post on some sub-Reddits, put your game into festivals, do Next Fest the quarter before you launch and once you've got at least 2,000 wishlists.
Functionally, it's not that different from itch.io. The scale is the difference. You'll get far more exposure to your games on Steam than you will on this site, so if you aren't getting a ton of views for your game on this site realize it's natural. itch.io is small and kind of niche compared to Steam. Use it to gauge early traction and don't get too disappointed if itch.io isn't throwing much traffic your way. Structurally, it can't.