Tbf, "just make the next Roblox" is kind of an insane business proposition. Roblox has enjoyed unprecedented success at engaging the same age range for 20 years. Most games that are anywhere near that old have for the most part followed their playerbase as they aged. Runescape is a great example, where enough of their playerbase in 2013 were the same people who were playing 2007 that they demanded a reversion.

Roblox, in contrast, has been extremely popular with 7-16 year olds for 20 years. They're funneling in new players faster than old players age out. It's pretty wild.

My personal theory is that Roblox largely stepped into the amateur game dev hole that Flash left.