Can I recover permanently deleted photos?

Recently I realized that all my photos were deleted from all of my devices (phone, iPad, and MacBook) and when I checked my deleted folder on each device nothing was in any of the album. A months prior to realizing this, I had deleted all the photos from my iPad and since all of my devices were linked, I think that might have caused the photos to get deleted from each device. I did not know this would happen and never checked until it was too late. I fear that I have waited too long and I won't be able to get my photos back, but I just wanted to see if anyone had any ideas. I have already tried to restore the photos from my iPad using the iCloud backup, but there was only one backup from a couple days ago, thus no pictures. Please let me know if there is anything I can do to get my picture back, thanks!