I'm spreading myself too thin. =I do too much./I work too hard.

—Can we schedule a photo shoot next Wednesday? 我们可以下周三拍一组照片吗？
—Nope, I'm booked until next month. 不行，直到下个月我都有预约了。
—Next month? Man, you're spreading yourself too thin. 下个月？你太忙了。

schedule a photo shoot 安排拍一套照片

I'm booked.=I'm full. 没有时间。
booked=no time available
I'm sorry, we're completely booked. There are no rooms available. 抱歉，房间已经订满了。没有可出租的房间了。