John Gill Commentary Esther 9:4

"For Mordecai was great in the king`s house, and his fame went forth throughout all the provinces; for the man Mordecai waxed greater and greater." — Esther 9:4 (ASV)

For Mordecai was great in the king's house
Not only over Esther's affairs, but was one of the king's counsellors, and was the chief minister of state:

and his fame went out throughout all the provinces ;
what a favourite he was of the king, as well as a relation of the queen, and how wise and just his administrations were:

for this man Mordecai waxed greater and greater ,
was more and more in the king's favour, and had offices of honour and trust heaped upon him, and increased both in wealth and power.