RecoveryOS issues

"RecoveryOS issues: I have a MacBook Air 2018 with MacOS Sonoma 14. There was an update so I updated it but when I log in I get a circle with a line through it (🚫). I went to the recovery OS to reinstall the macOS Sonoma but it’s telling me I don’t have enough space (needs 1.7GB more). What can I do to get this thing booted back up?"

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If you Get In -- Clear Space:

With little storage space remaining, your Mac will lag and you won't be able to transfer or reinstall it. So, see about backing up up items (for recovery purposes), and deleting them. Moreover, clear the System Data: How to Use Finder to Clear “System Data" on a Mac - User Tip

While in Recovery Mode:

Go into Utilities menu > Select Terminal > use commands to transfer items on your desktop to an external drive. You may have to mount the drive in Disk Utility in Recovery Mode. But, that's a trick of its own, and can take extensive effort.

Re: "I have a MacBook Air 2018 with MacOS Sonoma 14. There was an update so I updated it but when I log in I get a circle with a line through it (🚫)."

Am no expert in this area:

Seems your Mac lacked enough memory / storage space to complete the update properly.

A Mac generally needs around 50Gb in which to operate smoothly.

When you regain access:

You can : See used and available storage space on your Mac - Apple Support

and

Tips on how to: Free up storage space on Mac - Apple Support

Apple Support does provide an article that seems to relate to the issue you face:

If your Mac starts up to a circle with a line through it - Apple Support

Eg: article says:

"A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use."

1. Start up from macOS Recovery. 
2. While in Recovery, use Disk Utility to repair your Mac startup disk. 
3. If Disk Utility finds no errors or repairs all errors, reinstall macOS from Recovery.

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If you need more info. / help / support / contact options (online chat / phone / email etc.)

Try Apple's Support website for:

MacBook Pro, MacBook Air, and MacBook Neo - Official Apple Support