Which device or browser are you using?
I don't use the app it's too limited, so not sure if that, or the mobile browser shows 7 years of Purchases like a laptop .
If you can, switch to a laptop / PC and use Chrome. Then, far right on our Purchase History page from See orders All: Click on the down arrow , and select the year you wish to view, it goes back to 2017.
@mcgilken