I don’t know of a method to instantly get a measurement of the iOS file system and APFS snapshot Tidemark cupboard space like disk utility permits on macOS so I can’t reply your query instantly.
Your numbers are typical and don’t point out an issue or one thing you’re prone to “repair” or “optimize” additional. My iPhone 15 Professional experiences 11.68 and 15.75 GB respectively for 17.6.1 and system.
What is understood is you want the least house on the gadget to backup to a pc (macOS or Home windows) so when all else fails on low house that’s your final resort to get an excellent backup. I like to recommend doing this now to make sure you get AhatsApp knowledge backed up.
Subsequent operation with the least house is an replace from laptop the place it downloads the recordsdata wanted and applies an replace. You would need to await Apple to launch and replace or set up a beta on this gadget to strive that to power a cleanup and free house on this cellphone.
Over the air updates take a bit more room on gadget.
You’re doing the steps beneficial above and might hold doing them in case you suppose this may self-correct. Sadly, leaving the gadget related to energy in a single day and related to WiFi is the very best probability to be affected person and let iCloud backup get your knowledge backed up. The OS will attempt to consolidate house and offer you again free house, however typically you have to to erase the gadget (both self initiated or from a pc) to get a clear file system and maximize your house obtainable for what must be an operation with sufficient “free” house.
For those who suppose you would free one other 10 GB of utility knowledge, try this and wait. I in all probability would get a pc and erase issues at your level. That manner you’ll know if it was a brief “tight spot” the cellphone landed in or it’s essential scale back the information you retain on that gadget.