getting the extended security updates as the post above yours suggests is more important than all those things combined. I recommend using the
Simplix update pack which includes the extended security updates and excludes telemetry updates for you with much less hassle than any other method of updating Windows 7. it may look like russian malware at first glance but it's recommended by all the expert autists on the MDL forums so it's probably not malware.
if you decide to get Windows 10 instead, remember that the Enterprise and Enterprise LTSC editions allow you to disable more of the spyware than the Home or Pro editions.
if you don't want any software to access the internet without your permission I recommend
Malwarebytes Windows Firewall Control set to medium filtering. it can be used separately from the rest of Malwarebytes and isn't a memory hog (it's also not an antivirus). this is especially useful with W10 or if you pirate games. even the fucking calculator app tries to connect to the internet in W10, and you don't want your pirated games phoning home to EA/Activision with your IP address.