Ugh, that’s the absolute worst feeling, isn’t it? Deleting something important and then frantically trying to get it back. Been there with texts and photos more times than I can count.
Honestly, with Snapchat, it’s a super tough one. Those guys design their app to be pretty ephemeral, so when something’s gone, it’s usually gone for good, especially from their servers. iPhones are also pretty locked down, which is great for security but a nightmare when you’re trying to dig up deleted stuff without special tools.
You mentioned backups, which is a good thought! If you happened to have an iCloud or iTunes backup from before you deleted them, that might be a slim chance, but restoring your whole phone to an older backup is a pretty big step and would wipe everything new. Plus, Snapchat memories specifically often aren’t part of those general phone backups unless you’d explicitly saved them to your camera roll or something beforehand.
As for built-in iPhone features or Snapchat settings for recovery? Not really, not for deleted memories. They generally don’t have a “trash bin” like photos do. I wish I had better news, but a lot of the “free methods” online are either scams or way too complicated for the average person to try without risking their phone. Good luck, though – I’ll keep my fingers crossed for you!