My iMac is doing fine and I'm sticking with it for the foreseeable future. It may be possible to swap the fusion drive for an SSD, but the procedure is way beyond my abilities.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365