There are two mitzvot we observe on Hanukkah. Lighting candles is one; the other is reciting Hallel, the collection of Psalms 113–118. Hallel thanks God for our liberation, the candles light the way of liberation to come.
It’s easy to get caught up in triumphalism. Past liberation from oppression is worthy of song, but it is incomplete. True liberation will not come until the path to freedom is lit for all oppressed people everywhere.
It is our duty to light that path, to let our past triumphs guide us where the world is still dark.