Unless your software requirements specifically tie you to the Microsoft stuff, or other similar needs for certain Windows-only software, now might be a great time to seriously consider going over to an Ubuntu (Linux) setup on that box. While it isn't Win11 compatible (due to chips), it's almost certainly capable of running Ubuntu or one of the other Linux operating systems. Various browsers and anti-virus also have Ubuntu or Linux versions. Instead of MS Office there is LibreOffice (and others), for general writing/spreadsheet/presentation apps.
Choices, choices ... eh?
I've got an older box, too. It's perfectly serviceable and runs great, so I'm seriously considering Ubuntu for it. Just haven't gotten 'round to it yet.