Hello, Elensaissa.
It appears that your current macOS version has no updates available for it.
Maybe you're considering upgrading to the next major version?
The macOS version you can upgrade to depends on the model and year of your Mac.
For details about your Mac model, click the Apple icon at the top left of your screen and choose About This Mac.
❗️ – IMPORTANT – Backup your data. (You’ve been warned.)
Learn How to Back up your Mac with Time Machine:
https://support.apple.com/en-us/HT201250
❗️ – IMPORTANT – 32-bit apps won’t work in Catalina or Big Sur.
Use this free utility to check the compatibility of your apps:
St. Claire Software – Go64: https://www.stclairsoft.com/Go64/
📚 – Check Compatibility of your Mac with newer versions macOS.
How to get old versions of macOS - Apple Support