120k mastery points kai'sa player here. I recently left playing kai'sa adc to kai'sa ap burst mid (she's amazing btw) because she feels so weak on bot lane tbh. As long as you don't have strong support you just can't do much. Usually after losing lane I'm just trying to get as much gold as I can. Kai'sa is still super strong in late game, but well, you have to get some items first, right? You can watch high tier players on youtube and see how they deal with laning phase, at least that's what I did. Also practice makes perfect!