There is the '/users/self/media/recent' endpoint on Instagram. It seems that we can get our past media using the query string such as MAX_ID, MIN_ID and COUNT. However, the endpoint always returns only the last page in which the number of the posts is 20.
There is a way to get more than 20 of our own posts?
Because you are in "sandbox" mode. If you want to go "live mode" then you need to get approval from Instagram. Refer this link. https://www.instagram.com/developer/review/