Welp, I don't post often but this is just too much.
Literally no indie developers on Roblox can achieve that amount of "Highly Engaged Players" because those aren't CCU or Visit, but players that stays and come back in the game a lot over multiple days.
We, Roblox Developers, makes games for people to play them, if we can't have people play our game, what's the point of making games?
The barrier of entry is official way higher than any other platforms...
It looks like Roblox is restricting all games to Ages 16 by default.
To reach younger players your game needs at least 500 unique age-verified 16 players in the past 30 days.
Otherwise your game stays locked to Ages 16