On my online jams, I try to encourage people to post feedbacks to other games. It sure is important, but it's not that easy to enforce, itch doesn't give any tool to enhance that. I don't really want to make ranked jams though, but there are others around working like that. I for myself want to try every game of course, I review quickly the web based ones, for the rest it takes some time because I also have a job and so on. I'll give a feedback to yours!
I think that if every person taking part in the jam reviews at least 2 to 3 games, we'd have something nice. It happened some years. How many games did you get to test and review so far?
There's also the discord, it's nice to chat and show WIP during the course of the jam :)
I you didn't try that, I think you'd enjoy IRL jams. They're a whole different beast and are way closer to what you expect from a jam. Maybe you live in a remote area where it's not that easy to find (then you'd have to organize your one and be ready to have few people taking part, but it's still cool). If you live in a city, though, chances are a few jams happen once in a while. Usually they last 48 hours and are really nice to experiment.