It looks like you have fungal gnats, and a pretty bad case if you're filling yellow sticky sheets to that density. Fungal gnat larvae eat the fine hairs on roots, which eventually cause nutrient deficiency.
The most obvious nutrient you're lacking is Nitrogen, but you can't really fix that without healthy roots to absorb it. That's a long winded way of saying you have to address the gnats before you have any real hope of turning them around.
E. Also the soil looks super wet, which will cause root rot over time, but might be ok if you just watered them before snapping this picture.