I’ve had this hibiscus for 1 year it was beautiful and healthy and then it had gotten aphids. I had treated it for the aphids and things seemed to improve. But now it’s in such poor condition I’m not sure I can save it. It’s leaves have done everything from turned yellow to curl up and now they’re transparent. I fought so hard to get rid of the aphids that I’m beyond frustrated with this plant. Things I’ve tried to correct the situation: changing sunlight to more and less sunny spots, giving it more and less water, changed soil, fertilized it every month (each packet is premade so I don’t need to mix anything so I know it’s mixed correctly) I have it outside now that the weather is nice hoping that will help improve the situation. Please help I’m going to loose my mind with this plant.
If you've done everything you mentionned in the same year, it's likely suffering from overwork: too many changes and too much fertilizer. It needs some calm conditions in order to make a comeback. Just keep the soil slightly moist—not wet, not dry— and place it in a very bright place where you won't have to move it for a year, with either dappled sunlight or no more than two hours direct sunlight on it, and wait a full year before taking any other action.
Next time one of your plants gets aphids, try to put a ladybug on the plant, or rub some neem oil carefully all over the plant with your fingers to get into small textures. It'll look sticky for a few weeks but it will be cured of many things.