Why didn't Abraham's servant go directly to Rebekah's father's house instead of praying to God to test a woman at the well?

Abraham spoke to S1, the oldest servant in his household in Ge 24:

4 "Go to my country and to my kindred, and take a wife for my son Isaac.

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Abraham had two brothers, Haran and Nahor.

7b He will send his angel before you, and you shall take a wife for my son from there.

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God's angel would guide S1. He set out for his mission:

10 Then the servant took ten of his master’s camels and departed, taking all sorts of choice gifts from his master; and he arose and went to Mesopotamiaa to the city of Nahor.

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When he arrived at the city of one of Abraham's brothers, why didn't S1 just go directly to Rebekah's father's house instead of praying to God to test a woman at the well?

Nahor had 8 descendants (Ge 22:20-24). He did not want to systematically visit all these houses. He had a better plan.

11 He made the camels kneel down outside the city by the well of water at the time of evening, the time when women go out to draw water.

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That's the place and time to observe the women of the city. Abraham told him that God's angel would guide him.

12 And he said, “O LORD, God of my master Abraham, please grant me success today and show steadfast love to my master Abraham. 13 Behold, I am standing by the spring of water, and the daughters of the men of the city are coming out to draw water. 14 Let the young woman to whom I shall say, ‘Please let down your jar that I may drink,’ and who shall say, ‘Drink, and I will water your camels’—let her be the one whom you have appointed for your servant Isaac.

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S1 was looking for a kind-hearted female relative to be Isaac's wife. Sure enough, she showed up.

15 Before he had finished speaking, behold, Rebekah, who was born to Bethuel the son of Milcah, the wife of Nahor, Abraham’s brother, came out with her water jar on her shoulder.

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She did as S1 predicted. She passed his character test. She was kind, helpful, hospitable, and ready to serve without being asked. The encounter was orchestrated by God.