Mischiefmaker
You can’t force Hashem to do something He isn’t willing to do. I don’t know what it is you need but if you are asking for a miracle well….a segulah won’t get you a miracle. Davening can. Teshuvah can.
You want a powerful segulah well here comes 2
1. If I remember correctly you are a girl. If so I’m not sure your Tznius level but maybe it is lacking. Learn the Halachos and keep them 100%. That also applies to how you walk and act. Become a Tzanua. If that’s all in check look at #2.
2. Learn the Halachos of Shmiras Halashon of the chofetz chaim. Know them COLD and start keeping them strictly. Yeah its hard its VERY HARD. You might think impossible. But if you want big favors from Hashem you need to make big gestures. But don’t do it because you want whatever it is. Do it because its what Hashem wants.