Do not feed the scammers. The only person who can "guess" your password is you—so keep it secret, keep it complex, and keep your 2FA on.
Instead of resorting to password guessing, users can take steps to protect their accounts and regain access if they've forgotten their login credentials: roblox password guesser 2021
Do not use your Roblox password anywhere else. A "Password Guesser 2021" cannot guess gT7$kL9#pQ2@xR5 . Use a Password Manager (like Bitwarden or LastPass) to generate and store these. Do not feed the scammers