If your music was showing on Instagram but has since been removed, the likely reason is that you released an album containing songs that had already been issued as singles.
Instagram bases availability on the most recent release date of each track. If the album’s release date is later than the singles, it may cause those songs to become unavailable.
To resolve this, you can submit an Instagram Resubmission Request using the Instagram Resubmissions Form.
To prevent this issue in future releases, consider uploading the full album to eMastered before distributing the singles.