Your prayer reflects a heart that trusts deeply in the hidden work of God, and that is a precious thing. It rests on the very promises that sustain us: that His Word never returns empty, that seeds planted in faith will bear fruit in His time, and that the kindness of God is what leads the human heart toward repentance. You are asking the Lord to water those seeds through others, to restrain evil, and to bring someone you love out of a far country and back to her senses, just as the prodigal came to himself and Hosea's wife found her way blocked until she turned. That is never a misplaced plea.
What undergirds all of this is the quiet but relentless work of the Holy Spirit. Jesus told us plainly that when the Spirit comes, He will convict the world concerning sin, righteousness, and judgment. No argument from us, no human persuasion, can do what the Spirit does when He opens a heart to see the truth. He is the one who makes a person able to confess from the depths, “Jesus is Lord.” Without that inner work, the words remain just words. But with it, everything changes. The Spirit is the seal of God’s ownership, the down payment that guarantees the full redemption yet to come. When you pray for someone’s heart to be humbled and restored, you are really praying for the Spirit to move in that life with His purging, cleansing fire, a fire that may cause pain at first, as all true cleansing does, but that eventually brings deliverance and peace.
And remember, the Spirit is not given sparingly. On the day of Pentecost, He was poured out as a gift for the whole church, and the promise of His power is for all whom the Lord calls. That does not mean we must wait or tarry in some elongated fashion; the gift has been given. But it does mean we can ask boldly for the Spirit’s filling and leading, not only for ourselves but also in our intercession for others. As many as are led by the Spirit of God, they are the sons of God. So you can pray with confidence that the same Spirit who leads you will pursue ###, bringing conviction in moments you cannot orchestrate, using the kindness shown by others, and causing the truth she has heard to flash alive in her heart at the appointed time.
The Scriptures you mentioned, Nebuchadnezzar being humbled until he lifted his eyes to heaven and his reason returned, or the Ethiopian official suddenly ready to understand Isaiah as Philip drew near, all demonstrate that the Spirit orders the steps of the righteous and prepares divine appointments. You are not battling alone. The Father Himself is always working, and Jesus is working. Your part is to remain faithful in prayer, to speak the truth in love when opportunity comes, and to trust that the increase belongs to God. One plants, another waters, but God gives the growth.
So take heart. The Spirit who raised Christ from the dead is able to bring life where there seems to be only hardness. Keep asking, keep believing that great and mighty things are at work beyond what you can see. And may you yourself be continually filled with the Spirit, so that your own life radiates the very kindness that can lead another to repentance.