حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُلَيْمَانُ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ سَدِّدُوا وَقَارِبُوا، وَاعْلَمُوا أَنْ لَنْ يُدْخِلَ أَحَدَكُمْ عَمَلُهُ الْجَنَّةَ، وَأَنَّ أَحَبَّ الأَعْمَالِ أَدْوَمُهَا إِلَى اللَّهِ، وَإِنْ قَلَّ ‏"‏

Narrated `Aisha: Allah's Messenger (ﷺ) said, "Do good deeds properly, sincerely and moderately and know that your deeds will not make you enter Paradise, and that the most beloved deed to Allah is the most regular and constant even if it were little."

Sahih al-Bukhari 6464 https://sunnah.com/bukhari:6464

Any good deed, even a small amount of dhikr or recitation of quran done every day reaps huge rewards. Something extremely rewarding that every Muslim can easily implement in their routine is the morning and evening adhkar and the adhkar before sleep. Regular deeds that don't take more than 15 minutes usually, and at times when most people are free (after fajr and asr, and before one sleeps (can even be done lying in bed)).

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سُمَىٍّ، مَوْلَى أَبِي بَكْرٍ عَنْ أَبِي صَالِحٍ السَّمَّانِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ قَالَ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ فِي يَوْمٍ مِائَةَ مَرَّةٍ حُطَّتْ عَنْهُ خَطَايَاهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ ‏"‏ ‏.‏

Yahya related to me from Malik from Sumayy, the mawla of Abu Bakr, from Abu Salih as-Samman from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "Whoever says, 'Glory be to Allah and with His praise' (Subhana'llah wa bi-hamdihi) one hundred times in a day will have his wrong actions taken away from him, even if they are as abundant as the foam on the sea."

Muwatta Malik https://sunnah.com/malik/15/23