Put a cooldown on a individuals retrieved rep to combat rep bombing. The cooldown could also be on a random timer depending on how many reps has retrieved.
Though this could lead to the discouragement of legitimate reps due to a user pleasing or displeasing a larger group of people.
Allow guilds to choose to log all modifications/reps into a channel like dynos guild log.
For scaling this may be best to do using webhooks while storing the created webhook inside of the database.
Allow users to verify themselves in our discord to giving them a verified badge on their profile.
If a user leaves the discord the verified badge will be removed.
This badge can either be given via a reaction bot or via a command on the main bot.
This feature would need to be done on another bot to allow the bot to listen for member events like leaving due to discords new rules.