You've created a fairly sophisticated animation for your hexagon element, but now you can add interest and complexity by changing a few more properties. First, you'll stagger the starting points for the layers, so that each hexagon begins to appear at a different point in time in the composition. Then you'll adjust the opacity of the hexagons so that they fade in and then remain partially transparent.
The In point of a layer is the time at which the layer starts to appear in the composition. Right now, all your layers begin at 0:00, as shown by the position of the colored duration bar for each layer in the timeline. To create a more fluid animation, you'll offset the In points of the layers on the timeline.