Running the last gen Mac Mini Server which Apple decided to not support past Catalina. As a fan of TaskPaper, this appears to be the point where Apple obsolesce hits me because macOS 11 is needed for Bike and some other new apps I have tried this month.
With 16GB RAM, and the HDDs replaced with SSDs it is a perfectly capable desktop. I would upgrade macOS if I could, but it may be time to move it to Fedora. That won't solve the root issue with Mac apps - Intel architectures don't evolve so fast as a machine with this performance capacity becoming unsupported.