Wa alaykumussalam warahmatullah.
Qiyam al-Layl means standing the night in worship. It is a complete spiritual experience that goes far beyond just the units of prayer you offer on the mat.
If you want to build a deep night routine outside of the voluntary prayers, you can structure your time with these powerful acts of worship:
1) The moment you wake up, before making wudhu, wipe the sleep from your face and recite the last ten verses of Surah Ali 'Imran. The Prophet (peace be upon him) used to do this to ground his heart and reflect on the creation of the heavens and the earth before starting his night worship.
2) Spend time with deep Quranic reflection. Do not just rush through pages to finish a chapter. Read slowly.
When you come across a verse about mercy, stop and ask Allah for His mercy. When you read a verse about punishment, pause and seek protection. This turns your recitation into a real conversation with the Creator.
3) Dedicate the final window before Fajr to Istighfar. The last twenty to thirty minutes before the adhan is the time of Sahar. Allah praises the believers in the Quran specifically for seeking forgiveness during these late hours. Sit quietly and focus entirely on asking for pardon.
4) Make intense, personal Du'a. The last third of the night is when Allah descends to the lowest heaven, asking who is seeking from Him so He can grant it. This is your private audience with the King. Speak straight from your heart in your own language and lay down all your burdens.
You can also fill the gaps between these actions with general adhkaar, especially sending blessings upon the Prophet, saying SubhanAllah, Alhamdulillah, and La ilaha illa Allah.
Lastly, know that Qiyam is about companionship with Allah when the world is asleep. Mixing up these actions keeps your heart alive, focused, and fully engaged throughout the night.
Allah knows best.