Give and you shall receive is what I have to say. Do the work on playing and genuinely giving advice on other people's games. Also being active on the discord and sharing your link on the show off channel works. Try and make your game browser ready and keep the graphics simple enough so that low end pcs don't just jitter out when playing or add a less lag mode in the settings of your game. Try doing play test streams on YouTube or twitch where you have to fill out a form in order to submit your game and sprinkle in links to your game too, that way more people will see it. Also adding a nice gif to your thumbnail helps. I submitted "defender's magic" which is currently standing at 20-30 ratings, so I can bet you these techniques are effective. Here are some things I do not recommend. Firstly, doing rate for rates or DMing people on Discord will get you boosted ratings but they are always going to be bad ratings because people will think you are being stingy or greedy. Also begging for rates after giving feedback will annoy many people too, and can get you banned.