If you put more obelisks of Aswan near your houses DNA generates more quickly. Upgrading your houses also increases DNA production. Finally, having workers at the highest available level increases DNA production. If you use ankh spins you can win DNA and there are some DNA offers in the shop besides having to actually buy DNA.

Generally it's better to have more quarries. With only one quarry the workers get stuck in a line. For the second pyramid the optimal number was 3-4 workers per quarry.