On December 11, 2018 Instagram closed its API: https://www.instagram.com/developer/. Currently, Facebook is directing developers to the Instagram Graph API -- https://developers.facebook.com/docs/instagram-api.
This is where the rolling 7-day limit has been imposed on Instagram searches. Instagram data older than 7-days will need to be purchased through a third party. These can be expensive. Some options are:
-Crimson Hexagon https://www.crimsonhexagon.com
The Social Media Research Toolkit lists availability of social media tools. It hasn’t been updated since January 2018, you may find some resources on it that could be helpful. http://socialmediadata.org/social-media-research-toolkit/