Clear Rule Communication: Explicitly state the rules against alt accounts, ensuring they are specific and unambiguous.

Strict Penalties: Implement high fines and punitive measures, such as demotion from badges and trustworthiness scores.

Account Bans: Enforce a strict policy of banning accounts found to be involved in manipulation.

Enhanced Verification: Require rigorous authentication methods for login, such as mobile phone verification, to prevent multiple accounts.