SADAQAH JARIYAH
Choose to either build a new masjid or a school in a country of your choice and reap the rewards for long as it is being used.
Both these options provide an opportunity to earn Sadaqah Jariya, a form of charity which can provide lasting benefit to both the donor and the community who will benefit from the facility for as long as the building stands.
The Prophet 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)
Just imagine the rewards one can accumulate every time someone bows down in sajda to the Almighty in the masjid you helped build or the countless number of future generation of people that will receive an education thanks to your generosity; any good deeds performed including any knowledge that is passed on by the those that have been taught at this school or masjid and in turn on to others can multiply your rewards exponentially, each and every time someone in this chain performs a act of good.
Sadaqah can be made on behalf of family members and loved ones, those that are alive or have passed away.