Your options are significantly limited with what you can do with that amount of space.
You might have to consider blocking the upgrade and turn off upgrades.
How to block the upgrade:
https://www.groovypost.com/howto/block-windows-...
Turn off Windows Updates:
Press Windows key + R
Type: services.msc
Hit Enter
Scroll down to Windows Update
Select it then right click it
Click Properties
Under the General tab, choose Startup type to DIsabled
Click Stop
Click Apply then OK
If you want to upgrade, the best thing you can do is consider upgrading the storage, but if your system has a soldered in storage, then you can't upgrade without possibly augmenting your storage using a larger SD card.
See options you can consider:
https://www.groovypost.com/howto/maximize-stora...