Depend on how good a fish it is…
I have rested a fish for 30 minutes, before makeing cast number 2 at it… normaly changing the fly is also key, try changing to an emerging stage of the same insect, or go subsurface…
But often resting the pool is good enough.
If you havent spook’d the fish and it is still hard on the feed, then change the angle slightly, a step left or right might just get rid of micro drag.
Or you can create your own hatch, just keep drifting the same fly over the fish, I have seen that work pretty well on alpine trout… LOL, but it works.