If you don’t have any AI third-party upscaling tools to do the hard work on enlarge low res images, I find the best alternative is to use Photoshop Detail 2.0 Upscale. This is Photoshop Sensei AI beta testing upscale tool. Works best for upscaling low-resolution images or AI-Generated Images. This is how you can get it working in your Photoshop setup.
On the top menu go to Edit > Preference >Technology Previews Check the Box where it says Enable Preserve Details 2.0 Upscale Then go to Image > Image Size or Alt Ctrl I to bring up the dialogue box. Where it says Resample, [...]