There are 3 things you can do which Allah(SWT) tells us have unlimited rewards with Him(SWT):
And the retribution for an evil act is an evil one like it, but whoever pardons and makes reconciliation – his reward is [due] from Allah . Indeed, He does not like wrongdoers. [Surah Ash-Shuraa 42:40]
Say, “O My servants who have believed, fear your Lord. For those who do good in this world is good, and the earth of Allah is spacious. Indeed, the patient will be given their reward without account.” [Surah Az-Zumar 39:10]
The Prophet (ﷺ) said, “Allah said: The Fast is for Me and I will give the reward for it, as he (the one who observes the fast) leaves his sexual desire, food and drink for My Sake. [Sahih al-Bukhari 7492]
