I have a Mac book air that has Big Sur from 2013 how can I update software enough to get keynote

Hi Ewalani

welcome to the Apple (user-to-user) Community.

Am no expert in this area, yet your question surely deserves some response.

Re: "how can I update software enough to get keynote"

Identify your MacBook Air model - Apple Support

says

For 2013 models : Newest compatible operating system: macOS Big Sur

So seems your Mac cannot update beyond any Big Sur updates.

What's new in the updates for macOS Big Sur - Apple Support

says

macOS Big Sur 11.7.10 is the newest Big Sur update.

(You can check your version: Click black apple at top left of menu bar > About this Mac )

See: How to: Update macOS on Mac - Apple Support

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Re: "I just really need to install keynote or power point is there a way to do this"

The way I understand it:

the App Store will only install compatible versions of any Apple apps we attempt to download.

If your Mac is updated to MacOS 11.7.10, you could likely download a compatible version of Keynote.

The "Keynote" webpage (link below) links to the App store ...

(you can click "version history" to see the earlier versions).

https://apps.apple.com/us/app/keynote/id409183694?mt=12

All the best :-)