Alright, well a good rule of thumb is to have a maximum of 3 accounts / proxy. I know there will be many people who disagree with my statement, however this is the magic number for me, and many others. If someone claims they can add more than 3 on 1 proxy, they are not completing many actions on their accounts, or their accounts were created on the same proxy or IP, and verified using a physical private phone number. Feel free to experiment, but use the 3 account / proxy rule as your safe limit. The more actions you complete, the less accounts / proxy.
In regards to getting your pictures back, I would give you a 2% success rate. It would take you weeks trying to get a hold of Instagram. Its better just to start posting the pictures again, and try to be more careful next time.
Maybe someone else has a trick to getting your pictures back, however i doubly it personally as I have searched extensively and found no useful information. But I did not scan the entire internet