Windows 7 is fine w me. My only reason to upgrade them to 10 is so I can use them past Jan 2020 on the internet
Yeah, that's gonna be a day of reckoning for a lot of us.
My personal option is to use only Linux or MacOS for internet stuff, and use the Win7 machines for things where only Windows works, but not internet stuff. Once the updates stop, why connect to the internet with it if there are other safer options?
If you only have the one hardware machine, and it's got Win7 installed "on the metal", you might want to consider getting some virtualization software (VMware, VirtualBox, etc.) for Win7, create a (free) Linux VM, and use only the Linux VM for accessing the internet.