iPhone Is Full, Can’t Boot, Factory Reset Worked… But All Data Is Lost

My iPhone storage was completely full and it suddenly couldn’t boot past the Apple logo. After being stuck in a boot loop, Apple Support suggested doing a factory reset. The good news is the phone works normally now, but the bad news is that all my data is gone. I didn’t have a recent iCloud or iTunes backup, and I lost years of photos, notes, and app data. I’m wondering if there’s any chance to recover data after a factory reset, or if everything is permanently erased. If anyone has real experience with this, I’d really appreciate your advice.