Some examples of worship that can earn bountiful reward can include:
Above all, Muslims are encouraged to approach every act of worship with sincere faith in Allah’s bountiful mercy. The Prophet (peace be upon him) said:

“Whoever fasted the month of Ramadan out of sincere Faith (i.e. belief) and hoping for a reward from Allah, then all his past sins will be forgiven, and whoever stood for the prayers in the night of Qadr out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven .”
(Bukhari)