你怎么就/才来？我从三点就/才在这儿等你了。
I've not understood the difference between 就 and 才, I've this exercise on my book, can you help me to understand the difference with this sentence I wrote? Thank you!

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就
C.adverb
① （立刻） at once
▸ 我就来。
I’m coming in a minute.
▸ 马上就走
leave immediately
② （强调早） already
▸ 他昨天八点就睡了。
He went to bed as early as 8 o’clock last night.
▸ 她十四岁就上了大学。
She went to college when she was only fourteen.
③ （便会） then [used after 只要, 要是 to introduce a natural development of the previous statement]
▸ 要是你没来，我就尴尬了。
If you hadn’t come, I would have been embarrassed.
▸ 只要努力，就有可能成功。
If you work hard, you can be successful.
④ （强调数量） as many/much as
▸ 他光买书就花了500元。
He spent as much as 500 yuan on books alone.
▸ 一天就来三次
come as much as three times a day
⑤ （只） only
▸ 就等你一个了。
You’re the only one we’re waiting for.
▸ 他就住在附近。
He just lives somewhere nearby.
⑥ （强调准确） exactly
▸ 我就知道他会等我们的。
I knew he would be waiting for us.
▸ 我要的就是这个。
This is exactly what I want.
⑦ （表示容忍） [used between two identical elements to indicate resignation]
▸ 五块就五块，我买了。
I’ll take it for five yuan anyhow.


才2 cái
adverb
① （表前提条件） not until
▸ 我看了报纸，才了解到事情的真相。
I didn’t know the truth until I read the newspaper.
▸ 狼只有饥饿时才攻击人。
A wolf will only attack a human being when it is hungry.
② （刚刚） only just
▸ 电影才开始。
The movie has just started.
▸ 我刚刚才到。
I’ve only just arrived.
③ （只有） only
▸ 他到美国才一个月，就可以同当地人交流了。
He was able to communicate with the locals only one month after his arrival in the US.
▸ 我开始踢球的时候才五岁。
I started playing football when I was just five.
④ （表强调） actually
▸ 他才不傻呢。
He is no fool.
▸ 她才不想一辈子呆在那儿呢。
She has not the least desire to stay there forever.
⑤ （表时间晚） not until
▸ 你怎么这么晚才来上课？
Why are you so late for class?
▸ 我到半夜一两点才睡觉。
I didn’t go to bed until the small hours.