Extreme Storage Issues

So recently I've had the absolute worst time with storage on my phone. I've tried everything including using the default file cleaner, several third party file cleaners, and have even tried deleting my logcat files. Nothing has worked. What's even crazier is after I delete an app and then say record a video, after I delete that video and remove it from the trash (so its permanently deleted) there is a portion of that storage that never becomes free again. I look in the storage analysis and about a gig is actually being utilized by me and 62/64 GB are classified as "other". I have dug through my file manager trying to locate what these other files could be but to no avail. I understand some storage must be reserved for the OS, but this is absurd. Even after installing an SD card, my storage issues persist. Clearly it has something to do with something I am unaware of, so any help would be greatly appreciated!

Yeah my phone is a Samsung galaxy s9+