Consider a whitening schedule: preliminary daily sessions up until wanted shade

https://privatebin.net/?256519b74e30f1b0#3VLYsujJjSgep54k7bF7LrxfHScCN5yuvRyRGVE9Fu59

Think about a whitening schedule: initial daily sessions till wanted shade, then weekly or regular monthly touch-ups to keep brightness without over-bleaching.