How to downgrade macOS from Tahoe to Sequoia?

Jason—_ wrote:

my issues are storage due to macos taking around nearly 50gb of 128gb storage

Downgrading the OS is not the fix for a Mac with limited storage, and 50 GB is not a lot of system data, as storage goes.

Your biggest problem is the lack of storage capacity built into your MacBook with the 128GB drive. There is no fixing that, but you might use a portable external drive to house some of your folders and documents. The only real long-term fix is to replace the computer with one that has much more capacity.

The category named System Data (or Other) is a general category that measures the storage space used by all Apple and third-party files that don’t belong to any more specific category like Applications, Documents, Messages, Music Creation, Podcasts, Trash, and TV.

You can’t directly manage the contents of system data. That is done by macOS. The category varies in size depending on the current state of your Mac.

What you can do to create more free space:

• Reboot your Mac at least weekly. Let the OS clear caches and do housekeeping.

• Empty the Trash in the Dock. 

• Empty the trash in the Photos app.

• Delete unused and unneeded application installers from your downloads folder and desktop. No need to store on your Mac what you can freely download any time.

• Transfer files that you don’t use daily to an external drive and then delete them from the startup drive and empty the trash. Files that take up the most room are movies, images and music.

This from Apple on the subject of freeing up space:

Free up storage space on Mac - Apple Support