Tiny home cooling advice

I’ve built a 12x12 house in northern New Mexico, with average July high temps in the low 80s. I made the mistake of building 1’ eaves…I’ve got 7” of closed cell spray foam in the vaulted ceiling, R19 in the walls, and R26 in the floor. Reused fiberglass batts. No vapor barriers on the walls… Although that’s something that I can change, considering I have yet to put up drywall. I’ve installed a large southern window, and a 24x24 window to the north. Initially I was thinking using the windows for cross ventilation would be adequate, but it’s not.. I’ve been researching cooling tubes, but I’d like to find a solution that’s a little more cost effective and less laborious. Seems hard to find information on passive ventilation, so I’m wondering.. Would it make sense to install roof vents at the high point of my single slope roof? Would it create a draw if I placed a vent or two down low (floor or base of the wall?)on the opposite side of the house? Would a cupola be more advantageous than just regular roof vents? How do I figure optimal sizing for these things? Any input would be appreciated. Thanks!

Look at this site from Australia.
https://www.yourhome.gov.au/passive-design/passive-cooling

If you have sufficient water, you could build a swamp cooler into your 24x24 window.

Low intakes on the north side will work, at least for the shoulder seasons. They could be upgraded to cooling tubes later if you want

A safari roof and external shades could also help a lot.