I don't imagine the coup leaders have up power voluntary. Something must have forced them into accepting free and fair elections.
As someone living in an imperial country far from Bolivia I must admit I know next to nothing about the class struggle there. How did Bolivians manage to get the dictatorship to surrender? What are some good sources to get educated on the rise and fall of the Añez coup?
here is a good grayzone video about it
the MAS supporters took to the streets and lead mass protests and strikes, even when the dictatorship send the army and the cops to stop them they just couldnt do much, also the faiure to arrest the most important member of mas like Evo and other gave the protesters a lot of hope in their struggle also the the country side there was a growing militia threating any conservative supporter it found, all of this forced the Anez gov to do and Election to legitimize themselfs but thanks to the MAS people in the election and international observers (that werent the OAS) Arce was able to win and then take power somewhat peacefully