In the New Testament outside the Gospels and the beginning of Acts, again and again, the fact of Jesus’ resurrection is closely linked to our own ultimate resurrection, which isn’t life after death – it’s life after life after death.
Easter was when Hope in person surprised the whole world by coming forward from the future into the present.
Resurrection means bodily life after ‘life after death,’ or, if you prefer, bodily life after the state of ‘death’