This Shabbat it’s a good idea to accept upon ourselves a resolution to do a mitzvah especially a resolution pertaining to speech and our mouths like smiling more, not speaking evil, saying gossip or slander about others, to try to avoid forbidden foods and to make an effort to speak well of ourselves and others. This Shabbat the prayer of the individual is also very powerful whereas the whole year group prayer is more powerful. Such a personal prayer can bring about salvation, change nature and cause miracles to happen.
According to Rabbanit Yemima Mizrachi this personal prayer should be for his own personal redemption and for the redemption of all of Israel. The smallest resolution we make this Shabbat Hagadol has the power to turn worlds around since it has great impact in the heavens and the way one conducts himself on Shabbat Hagadol will carry over into the Seder night.
An additional Segula (spiritual remedy) is that on the Seder night a person should conduct himself as if he just came out of Egypt. This means to consider himself as if he already was redeemed from what was troubling him and he already attained the salvation he prayed for. He should picture himself as flowing along with a pleasant life and that everything is as it should be.