Maybe you should look into the craftworlds and how they run and see if any of the particular theme of any craftworlds fits the way you want to play them. Then see if there is a variation that you like. Ulthwe is nice put they focus on psykers and guardian units where as mymerea are all about war the way the eldar were before the fall. I mean anyone will play any way it just maybe easier to find a direction to go.