I donāt think you should ever stay completely married to a plan.
If you buy something as a long term hold and then the bottom falls out eg Asos, you have to essentially think of it as a new decision, would you buy now? You either double down, stick or twist but holding just for principle isnāt sensible.
Same with if youāre lucky and it goes on a run, you might believe in the company long term but if you think itās expensive, it can still be worth taking profits and going back in on a dip.