my Macbook pro isn't listed

Probably would need to get an older version macOS.

According to compatibility, there may be Catalina, or

perhaps if you want to push your luck, Big Sur11..?

• How to get old versions of macOS - Apple Support

https://support.apple.com/en-us/HT211683

Check compatibility:

• macOS Big Sur 11 hardware requirements
• macOS Catalina 10.15 hardware requirements
• macOS Mojave 10.14 hardware requirements

Download an installer ^ from their link, with Safari browser.

Related Article (monterey is too new)

macOS Monterey is compatible with these computers

..january2897:

The 'active links' go to each of the items listed, at Apple download servers.

The cost to get those 'downloadable installers' is nothing. They take time

& attention to detail. And sometimes they fail to load, due to internet slow-

down or other details one may miss reading about.

You may also try a version of freeware 'office-like' LibreOffice.

https://www.libreoffice.org/get-help/install-howto/macos/

The LibreOffice is an OK suite of good software, while not an Office clone.

Among different versions are older ones said to be more stable; or ones

that may be newer. On the other hand, if you do try for macOS upgrade:

Be sure: create backups, on external USB drives; w/ Mac's Time Machine.

Since a 'system upgrade' may have issues; better to enter into the idea

with a means to re-install; or get parts, to anything that could be lost.

LibreOffice can share files with and complete MS Office projects.

Good luck & safe travels! ☺︎