You won't find any automated way to delete a Roblox account on its website. Use one of the 3 methods listed in the post to delete Roblox.

How to delete a Roblox account permanently? There is no option for a player to simply deactivate or delete his or her Roblox account under game settings, just like other social media accounts or ...

They also provide actionable tips for parents on determining whether their child is ready to use Roblox, keeping them safe, and when to reverse course and delete or take a break from the platform.