Hi, i’m not a pro in this topic, but worked in Topaz on few shows, and i don’t think there is much you can do.
You can only slightly improve the footage, so garbage in -> slightly better garbage out.
If you try achieving too much, you will end up with artefacts and horrible abominations (been there, done that).

Use fine tune model, and slightly increase parameters until you see too much artifacts. Stop at that, and that’s the best outcome you can achieve.
I didn’t find anything better for now.