You generally cannot see deleted Instagram messages once they are removed from both sides of the chat
Check if you received an email from Instagram containing the message content or notification details
Review any device notifications that may have shown the message before it was deleted
Check if you previously backed up your phone and can restore an older backup containing the messages
Use Instagram Data Download to request your account data and look for message records
Check other devices where your Instagram account may still be logged in for cached message previews
Ask the other person in the conversation to resend the deleted message
Avoid third-party apps or websites claiming to recover deleted Instagram messages