I suppose I've reached a similar points with a decent number of games recently such as Claire Obscur or the Oblivion remake. The game isn't doing anything wrong but I just conclude that it's work and move on to something else. Still, there are a ton of very good movies on Tubi I could be watching, books I could be reading and a dog I could be walking. These are typically guilt-free loops unless the book is monotonous, so the advice is to read something harder.

As far as a game that didn't become a repetitive loop I'll praise UFO 50 for having a ton of challenging variety at least and you'll quickly discover a different challenge every time you switch to a different title. Overall I think what you need to recognize is not whether you complete a game, it's whether you feel rewarded for your time spent. If not, just plant a victory flag in whatever achievement you just obtained and move on, nobody will judge.