I've had thrips the last couple of grows. A healthy plant with a complete plant food can grow fine with thrips. It's an irritating nuance but not the end of the world IMO. Running potassium silicate at 30ppm+ residual really helps to keep the numbers down. Humic/Kelp mix is another great additive that adds a lot of good trace minerals, vitamins, plant growth regulators and chelators.
If you do all the necessaries the situation should be kept under control and even get better. I had more thrips at the start of flower compared to at the end, but I also pushed silicate all the way through flower but no foliar sprays.
I do citric acid 300mg per liter of water and 3ml unscented dish soap followed by potassium silicate at 1.0 EC with 3ml of unscented dish soap as foliar spray.
ISO alcohol sprays with 2 parts water and one part alcohol also works well. Sometimes I combine ISO alcohol with the other ingredients but only do that with cation. Always spray on small patches when trying out new formulas!