Good going!
I propose to build the two monasteries right after the WB. After that, aqueduct, and then Observatory.
We can send stone to Elizabeth, and in a few turns we have iron and whale to send to Capac and Washington for example. Then, cancel the copper supply to Washington and send it somewhere else.
Researching PP looks like the best choice. After that, perhaps Nationalism -> Constitution? Gunpowder is an alternative but has little immediate uses.
I hope that the AI will get Guilds soon, then we can research Banking and Economics for the free GM and Free Market.
A completely different route is to train an army to take out Alex. A handful of maces and a few cats should be enough as he doesn't have longbows yet. His lands would likely be taken over by Lizzy, Washington or Capac, which is not too bad.
And yet another completely different idea is to research Nationalism and build the Taj Mahal for more culture and an extra (temporary) boost of hammers and commerce.