Restore deleted photos

If you deleted the photos just recently, they may still be in the Recently Deleted album, where they are saved for thirty days, see: Get help with missing photos - Apple Support

If the photos have already gone from Recently Deleted, you need a backup to recover them. Without a backup you need expensive third-party recovery software, for example Disk Drill (https://www.cleverfiles.com/data-recovery-software.html). data Recovery software will not help at all, if you have been using iCloud Photos and your photos have been in iCloud and not on your Mac. You can only recover what has been stored locally. If you want to try data recovery, stop using your Mac at once, because anything you do will overwrite more items that might be recovered. And use only software that offers a free trial versions that will show you what could be recovered, before you have to pay.