Hello and welcome here.
While I do understand Spanish to a certain degree, I think until an auto-translation feature (like in Mastodon or Akkoma) is implemented in Lemmy, it would be better to keep this instance English only.
This is a pity as your group sounds very interesting otherwise :)
I am currently only aware of this South American instance, which might be open to host Spanish speaking communities from other nearby countries: https://feddit.cl/
Edit: I talked to TheCoffeeMaker (you seem to know him) and I would be happy to provide some guidance how to set up an instance in Argentina.