6 Ways to Earn even after death:
1. Give a copy of Qur'an to someone. Each time one reads from it, you gain.
2. Donate a wheelchair to a hospital. Each time a sick person uses it, you gain.
3. Participate in building a masjid or donate money for a new masjid to be built.
4. Place a water-cooler in a public place.
5. Plant a tree. You gain whenever a person or animal sits in its shade or eats from it.
6. And the easiest of all, share this message with people. Even if 1 applies to any of the above, you gain.
Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "When a man dies, his deeds come to an end except for three things: Sadaqah Jariyah (ceaseless charity); a knowledge which is beneficial, or a virtuous descendant who prays for him (for the deceased)."[Muslim].
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You will be rewarded continually as well, in sha Allah.