It would be helpful to understand what types of games the kid was playing in the first place to suggest alternatives. I ripped this answer from quora on how to see which games within roblox your child was playing

• Game History: Roblox used to have a "Game History" feature that allowed users to view a list of recently played games. This feature showed the last few games you played, but it was limited in terms of historical data. It's worth checking if this feature is still available in your account settings.
• Roblox Account Activity: You can check your Roblox account's activity feed, which may show some information about recent game interactions and achievements. However, this feed typically doesn't display a comprehensive game history.
• Roblox API: Some third-party websites and tools may offer services that attempt to retrieve and display more extensive game history data by accessing Roblox's API. Be cautious when using third-party services and make sure they are reputable and secure.

I went looking for any kind of account tracker and to no one's surprise they are mostly about account value from items, not so much about worlds/experiences they have been on.

Most of the responses I've seen on here are just suggesting games which may or may not be to your kids looking purely based on those games being generally accepted as good.