How do I get more space on my iPhone

An iPhone's storage can't be increased, it is a fixed size.

Freeing up storage space on your iPhone.

Here are some helpful articles that can guide you on how to free up storage space on your phone.

How to check the storage on your iPhone, iPad, and iPod touch

https://support.apple.com/en-us/HT201656

Manage your photo and video storage

https://support.apple.com/en-us/HT205703

Clear Other storage on your iPhone or iPad

https://support.apple.com/en-us/HT211686

you cannot expand the capacity of your iPhone

this video may help you free up space

If you need more space on your phone, you will need to delete something. You can’t add storage space to any phone.