Quran18:107. Subhanallah! Just having Eeman (Beleif) and Sawlihat (righteous) deeds confirms Jannatul Firdous.

Al-Kahf 18:107

إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ كَانَتْ لَهُمْ جَنَّٰتُ ٱلْفِرْدَوْسِ نُزُلًا

Indeed, those who believe and do good will have the Gardens of Paradise[[ Al-Firdaws, the highest place in Paradise. ]] as an accommodation,

যারা বিশ্বাস স্থাপন করে ও সৎকর্ম সম্পাদন করে, তাদের অভ্যর্থনার জন্যে আছে জান্নাতুল ফেরদাউস।

Subhanallah!
Seems achieving Jannatul Firdous is so easy.

Then, what do the ‘Sawlihat’ deeds consist of?

It’s simply to obey the command of Allah and refrain from prohibitions.
It’s simply to avoid those acts which cause punishments.
It’s simply to remain steadfast on Deen
And it’s simply to reject Shirk, Kufr, and Bida’a.

Therefore, ‘Sawlihat’ deeds actually mean the obedience of the Sharia’a of Islam.

And Allah knows best.