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Unfortunately the plants roots are damaged and will have a less of a chance to regain vigor. You may be recommended to flush your soil and re-fertilize, however I don't think it will help much at this point. This is a perfect opportunity to learn about over-fertilizing plants. Its so important to get an EC or TDS meter and learn how to use it. When you start watching the EC you will know exactly what you are doing. Without a meter one is only guessing and taking risks and can waste growing time. I run 1/2 recommendations of the manufacture or less and fertilize with ever watering.
This is not too bad. Get rid of your resovoir or mix. Use plain water, or 1 cap of liquid seaweed per 10 litres which is very gentle and effective. https://www.diy.com/departments/verve-liquid-seaweed-plant-food-1l/943677_BQ.prd You have plently of leaves for flowering. Don't be tempted to take those damaged leaves off. They are still working ok. This will just stunt your crop even more. Try to use a substrate which is less waterlogged next time. Ez.