السلام عليكم ورحمة الله وبركاته استاذنا، أحسن الله اليكم ، If I missed Fajr due to oversleeping, can I still pray Sunnah? And can I still make the Fajr prayer long (reciting long suwar and staying in sujūd)? May Allah keep us steadfast in fulfilling our obligations. بارك الله فيكم وجزاكم الله خيرا

Ustadh AbdulAziz al-Haqqan

Yes and yes