This is what squashes gnats for me.
maqsuito dunks in water Rez. This take a month to become super helpful though.
Sticky traps are more for monitoring.
sand or diatomaceous earthtop dressing.
My experience is watering habits are The number one factor to dealing with gnats.
consistency is key. I’m guessing your in soil because of ewc top dress? If so maintaining constant moisture levels instead of the flood to dry type method. Usually this means more waterings with less volume. Like daily 2 cups instead of every 3 days half gallon or whatever. Does this make since sorry I’m rambling maybe….
steering towards a more bacterial dominant soil instead of fungal dominant.