When government had a decree against the Jews, Esther organized a fast. Some must be in parliament to influence decisions that are in line with God’s laws.
Mordecai suggested to Esther that she she might be in her position so she can influence things to favor Jews. Esther 4:14 For if you remain completely silent at this time, relief and deliverance will arise for the Jews from another place, but you and your father’s house will perish. Yet who knows whether you have come to the kingdom for such a time as this?”