That's the big question. How do you do what Castillo failed to do? Imo you use your seat to build mass organization by whatever means necessary. Pardon Castillo and send him out to be the man of the people raising up worker and peasant organizations. Be cautious in your work for a few months, no constituent assembly or anything, just simple socdem economics and good relationships with other South American leftists. Join ALBA, maybe. When you assess the balance of power is ready (and I think that only takes like a year), then you can for the constituent assembly. You do exactly what Castillo did that got him arrested, but with popular power and Bolivian inspiration, you don't let them arrest you.

Pretty much, the military is still captured by the comprador elite.