Yes! You can reach out to your local Mission office to see what opportunities they have. There are missionaries all over the world who would welcome support from volunteers. But even if you are not ready for such an experience, you can be a volunteer of TPMS by helping spread the voice about the need for prayer and material support the Church in Mission territories has.
You can also follow in the steps of the founder of the Society for the Propagation of the Faith, Blessed Pauline Jaricoct, invite your friends to pray daily for the missions and donate regularly.
Last but not least, you can make sure your parish has the World Mission Sunday poster hung and that the priest- or deacon- preaches about it on the second to last Sunday of October.