Do you think your game has good monetization? Those are a must. Roblox prefers to push out games that generate as much revenue as possible.
Another major player is acquisition. How many people play your game after seeing it while scrolling through a sea of other games? Your thumbnails/icon need to stand out from the crowd to entice the player to click. In my opinion, this is the most important piece of the puzzle. A good thumbnail can make a huge difference and give your game a very good boost in players. I find that whenever I switch to a better thumbnail that has a higher ctr, not only do I see an increase in players, but also an increase in the number of home page impressions.
One recommendation is to give thumbnail personalization a shot. You can have at least 5 thumbnails, and see which ones perform the best. I managed to revive a game of mine that had almost zero players by doing this. It could work for you too if you get some good thumbnails going.
Almost every time I have used a good thumbnail or icon on one of my games with a high CTR, I’ve seen considerable increases in home page recommendations. I had one game go from 400 ccu to 1000+ ccu almost overnight after major ctr improvements.
Let me know how it goes for you or if you have any questions!