Just as the water quantity matters to plant growth same goes for the sunlight. Some plants are long day plant (they need more sunlight) while some are short day plant (they need less sunlight and boom well in long duration of dark). So this sunlight quantity could be a reason for your lifeless plants, search individually the plant either they are short or long day plant. Then put them accordingly that may help too. Btw very nice collection of plants, liked them👍❤