Explanation
To import new contacts gathered from an external web form at high frequency into Marketing Cloud, Northern Trail Outfitters should perform a daily bulk export to SFTP for import via automation. This will allow them to batch the contactsinto one file per day and import them into Marketing Cloud using an automation that runs at a scheduled time.
References:https://help.salesforce.com/s/articleView?id=sf.mc_as_import_activity.htm&type=5