Iphone storage unchanged after syncing icloud, waited for days..

iCloud is a way / conduit to have files on you iPhone

There will be Copies of the same files also on iCloud so you can access the same files from Other Devices you own & using the same Apple Account can also access the files

The used store space On the iPhone will not normally change

Automatically keep your files up to date on your iPhone and computer with iCloud

Delete files in iCloud Drive on iCloud.com

sumunn19 wrote:

Thank you for your response. I got the same answer from Apple support...but how does it explain that other iphone users (people around me) have no issue like this where their iphone storage used are barely 10gb and they have even more photos and videos (large files) than me. I am sure there is some issue with it...

You are welcome

So " I got the same answer from Apple support "

Well, Apple Support and self agree

What did Apple Support say about making space On the iPhone

No doubt they may have Already suggested

refer link

How to check the storage on your iPhone and iPad

Shopping around for answers why Other People do not have this issue does not technically pertain to your iPhone Setup

Each person's iPhone and setup is Unique to that persons iPhone and how that use it

sumunn19 wrote:

regardings this, "Each person's iPhone and setup is Unique to that persons iPhone and how that use it" so my question is what setup do I need to change in order to get the same results as my friends?

already selected "optimize storage".

Without having Direct and Physical Access to the Others iPhones

It would be impossible to answer your question