Transplant shock - the plants are using their energy to establish roots, rather than maintaining the leaves. Keep them out of the sun, and they should perk up in a few days. In future, don't add fertilizer when transplanting, as this encourages leaf growth at the expense of roots.

Try a spot with afternoon shade. Some plants need full sun, but don’t like hot afternoon sun. Gerbera daisies always droop like that for me when it gets hot if they get western sun. I grow them on the east side of the house now and they are much happier. If they are just planted, the little root plug could be drying out before the rest of the soil does and they might need an afternoon drink until they get some root growth going.

The sequence you gave implies transplant shock. All you can do about that is keep it watered.

I water my basil plant every morning. It was doing okay for the past weeks. This morning, I’m surprised that my basil plant suddenly drooped. I noticed that its soil is dry though I watered it yesterday morning. I also have a DIY self watering system on it. However, I have been putting coffee grounds and used teabags every other 3 days to its soil. Could it be too much nitrogen? Should I water her more often?