During the course of his career, Mayta served as defense counsel for victims of the "Massacre of Black October" in El Alto which took place in 2003 during the Bolivian gas conflict.

He entered Bolivian politics at 48 years of age, participating in the 2019 general elections as a candidate for the position of Senator for the Department of La Paz on behalf of the Movement for Socialism, however those results were annulled following alleged fraud.

On 13 December 2020, Mayta announced Bolivia's intent to rebuild relations with Venezuela, Mexico, Cuba, Argentina, Nicaragua, and Iran, all of which had been frozen by the government of Jeanine Áñez.

[3] Mayta said in a statement that "[Bolivia] must advance unity of the region and that is why we must talk with all nations," and discussed efforts to recover export agreements with Cuba and announced the reopening of the Bolivian embassy in Iran.

[3] Speaking to Página Siete, Mayta reported that on 10 December he had met with Charge d'affaires Charisse Phillips to discuss rapprochement with the United States.