There are three hours each day in Ramadan not to be missed at all costs.
Hour before breaking your fast
Prepare your meal early and dedicate this time for dua because the supplication of a fasting person before he breaks his fast is never rejected. Pray for yourself, your loved ones and the whole Ummah. And don’t forget our brothers and sisters being oppressed around the world and those who have passed away among the Muslims as they need your dua.
Hour in the last third of the night
This next hour is around the last third of the night. Dedicate this time with plenty of dua and seeking forgiveness as it’s a time when Allah سُبْحَانَهُ وَ تَعَالَى descends to the lowest heaven calls out: ‘Who will call upon Me, that I may answer Him? Who will ask of Me, that I may give him? Who will seek My forgiveness, that I may forgive him?’”
The Hour after the Fajr prayer until sunrise.
The last hour should be spent after the Fajr until sunrise with lots of dhikr (remembrance of Allah) and reading Quran.
The Messenger of Allah صلى الله عليه وسلم said: “Whoever prays Fajr in congregation then sits remembering Allah until the sun rises, then prays two rak’ahs, will have a reward like that of Hajj and ‘Umrah.” He said: The Messenger of Allah صلى الله عليه وسلم said: “In full, in full, in full.”
(Saheeh al-Tirmidhi)