driver.sendDirectToUser ERROR too-many-requests

[MonsieurPatate]

I'm trying to send broadcast notification in direct message via bot (bot repository):

const { driver } = require('@rocket.chat/sdk');

module.exports = (robot) => {
    robot.respond(/notify/i, (msg) => {
        let userNames = ['1','2','3'];
        userNames.forEach(userName => driver.sendDirectToUser(message, userName));
    }
}

In the administration panel I turned off all rate limiters, but every time I get an exception :

ERROR [createDirectMessage] Error: {
isClientSafe: true,
error: 'too-many-requests',
reason: 'Error, too many requests. Please slow down. You must wait 54 seconds before trying again.',
details: { timeToReset: 53009 },
message: 'Error, too many requests. Please slow down. You must wait 54 seconds before trying again. [too-many-requests]',
errorType: 'Meteor.Error'
}

I have about 2000 users and I don't think that it should be a problem.