Leave it to drain and cross you fingers. Cut off the flowers. Meanwhile buy another plant. Basil is an annual and not worth spending too much effort on resurection if it's dying.

it has drained few days ago. i will cut off the flowers. Do you think i should change the soil? If Basil plant cant make it, i will buy a new pot. It is very difficult to have a basil plant. My money plants is growing very well though.. Many thanks for your valuable advice

I see lots of flower stalks on those. Has it set seeds yet? Or did it get overwatered while blooming, but before seeds developed.

If it's produced the seeds, it will die. That's how annuals work.

Save the seeds, plant them in a new pot, or pull up the dying/dead plants and plant the seeds in that mix again, after adding nutrients/compost and letting it dry out.

Also, for the record, the wilted leaves will still make a nice big pesto feast. Try to "harvest" before the leaves turn brown.

I will take photo of the flowers tomorrow , i dont know how to see whether it has seeded or not, i think overwatered should be the reason. The leaves has withered.