As razmee209 says, if you contact Apple directly, they will suggest that rely on your backups that you've made.
iCloud Photos, if you use it, "synchronizes" its Photos Library with the phone, so what you see on the phone is what is at iCloud. iCloud Photos doesn't keep pictures in "Recently Deleted" any longer than the phone does.
If you don't use iCloud Photos, but you have Settings>Apple ID>iCloud Backup turned on, then you may be able to recover data. You should look here:
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
“Restore” is what you do when you buy a new phone, so this safety, if you have it set, requires you to erase everything on your phone and replace it with the backup. You would have to get to the backup quickly before it's replaced by a newer one. However, if you did have iCloud Photos enabled, then the iCloud Backup wouldn't make an extra copy.
Unfortunately, if you don't keep your own backups to an external drive, then there really isn't any place else to look. To back up your pictures you can just plug in an external drive, select the pictures, and use Share>Save to Files. Alternatively, you can backup to a computer:
Transfer photos and videos from your iPhone or iPad to your Mac or PC
If you haven't done one of those backups, then your remaining pictures continue to be in peril.