There’s still around two more years of support for Windows 10. By that time, it shouldn’t be too expensive to upgrade some components to some second-hand ones that perform better than your current ones.
This happens every year anyways, when IT departments need to spend their remaining budget. A lot of people set up home servers on ex-office small form factor PCs like HP ProDesk/EliteDesk, Lenovo Tiny, etc. Companies are always throwing them out when they upgrade, and as a result there’s always good deals for them on ebay. A lot of companies have a 2-3 year upgrade cycle.
How long do you think is reasonable for a vendor to support their old software version once they release a new one? If they drop support in 2025, Windows 10 will have had 10 years of support. It was released back when Linux kernel 4.0 was the latest version. Would you expect distros today to support a 4.x kernel? (yes, I know RHEL still does)