Web builds definitely have an advantage in jams. So do games with really strong cover art.
But if you've got neither of those and you think you have something worth checking out, you should definitely participate in rating for rating threads. Also good idea to go check out other people's games and let them know what you think. It's a ton of fun to see how other people approached the same problems you did and its fun to engage with a community of other devs. In addition, it probably also helps you get more back reviews, I know personally I go and check out and review anyone who hits up my game. Not everyone does that, but there is a pretty strong correlation with people you see in the comments of a lot of games and people who get a lot of reviews.
I think what you are fighting against in a game jam, especially a huge one like this is there is going to be a massive range of games some of which are not even playable. You have to give people a reason yours is worth checking out. (Especially since ratings are correctly hidden until the end people will be looking at proxy measures) I know I'm much more likely to grab games from the discord/ratings threads or that I see active in comments because there is a better chance they will have a playable build somewhere for me to check out or that the devs believe in their work. Unfortunately, a lot of hidden gems get lost this way, but that's the nature of a huge jam like this.