the discordpy cooldown error does not allow other errors to be raised

The Error Handler checks if the error is the CommandOnCooldown error. If it isnt, the error gets ignored. Add another else statement:

@bot.event
async def on_command_error(ctx, error):
    if isinstance(error, commands.CommandOnCooldown):

         if error.retry_after>3600:
         ....

         else:
         ....
    else:
         Stuff the bot should do on a different error come here