I can understand you very well. Because this situation drives people insane indeed. I once have the same trouble. here's some tricks to free up space on your phone.
1. Go to Settings > Safari > Clear History & Clear Cookies & Data. This takes up a surprising amount of space if it isn't cleared on occasion.
2. Go to Settings > General > Usage > Here, you'll see a list of apps that are using your space sorted from the app taking the most space down to the app taking up the least space. Right from here you can remove apps that are killing your storage.
3. I would recommend backing up photos and videos to your computer regularly than deleting them from your phone.
4. You can turn to some third party for help. Some professional software support us a efficient way to do. I downloaded a software named
iMyfone Umate iPhone Space Saver on Helloween. It can
free up space on iPhone and speed up your device by two steps. It not only scan your iPhone and find the junk files which need to be deleted, but also make lossless photo compression to save your space. What's more, it can manage and delete unnecessary apps to reclaim storage. Awesome! It helped me saved more than 4 GB space.
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