I have been sharing my game using the link from my dashboard instead of the link to the Game Jam. I believe it has really been hurting my ratings. Just so you know, be careful to share the jam link, not the direct link.
Also, if you list your game as Pay-What-You-Want, set the minimum to 5$. Itch.io takes a cut from every transaction and if you set it too low, you will lose at least 40% of your revenue in fees. I know from personal experience.
Some people have also had good luck with putting the product up for 5$, with free community copies. They found that more people downloaded it because charging money subconsciously make people value something more.