iPhones ram build up

There is nothing to fix in RAM. iOS manages RAM optimally. There is no way to improve on how it is managed automatically. Unix virtual memory management, which is used by iOS, has been perfected in the 50 years since it was first implemented.

Do you mean RAM or storage? RAM is fixed at 3GB, and is managed by iOS. Any apps that claim to manage it really just get in the way of what iOS does best without help. Storage is somewhat under your control, as describe in the post from Community Specialist Sparks0829.

Hi there iConnect_1,

To manage the storage on your iPhone, you can follow the guidance below:

If your device is low on storage, it automatically frees up space while installing an app, updating iOS or iPadOS, downloading music, recording videos, and more.

To make more storage available, your device may also remove items that can be downloaded again or aren't needed anymore. This includes things like apps that you don't use and the local cache for files in iCloud Drive. Your device also removes temporary files and clears the cache on your device.

Work through the suggestions in this support article to clear some storage space on your iPhone: How to check the storage on your iPhone and iPad - Apple Support

Take care.