The game needs more Synergies and more Champs for comp variety
If you want build diversity, there needs to be less consistency. There should be emphasis on splashing, which is what creates variety. As it's stands, it's very easy to econ a specfic comp, and the nature of this game dictates that certain comps will have a mathematical advantage. Achieving those comps less consistently creates more risk, and players able to splash effectively will have more effectiveness on average.
More origins + more classes + more champs = More diversity