By the late 17th century, the numbers of individuals emigrating to the colonies as indentured servants declined because

Europeans became aware of the cruelty of plantation masters and the high death rate of servant

Explanation: Is this what you meant?

In the Caribbean, the number of indentured servants from Europe began to decline in the 17th century as Europeans became aware of the cruelty of plantation masters and the high death rate of servants, largely due to tropical disease.