You don't need to pot up all the plants individually. But they'd probably benefit from some separation, ie divide into clumps and pot the clumps separately. Do it once they've got to the stage where you think you can do it without damaging them too much.

Remember basil likes it hotter and wetter than most herbs. Try to keep it moist, and it'll do better indoors than outdoors.

Coriander & Parsley Curled:-

These are both in the carrot family and the carrot family in general tend to germinate slowly. Give it another 2-3 weeks.