What are your criticisms of Chavismo and Maduro just out of curiosity?
now i'd like to preface this with a disclaimer that any opposition ghoul would do nothing but sell the country out to the USA and UK every which way in a heartbeat--maduro is better than any alternative, whether that's guaidó or whichever neoliberal puppet they prop up to replace him.
anyway, there were two key problems with chavismo. firstly, it's fundamentally a national-bourgeois led social democratic movement. obviously in an imperialized country like venezuela this made it profoundly progressive, and the achievments of the bolivarian revolution were incredible--chávez cut malnutrition in half, cut unemployment in half, sent millions of children to school and gave millions of elderly people pensions. however, this project of wealth distribution ultimately had to accomodate the national bourgeoisie. which of course on one hand you can argue was completely necessary, but on the other hand allowed the parasitic classes to entrench themselves firmly within elements of the state apparatus and made chavismo as a project entirely incapable of confronting the national bourgeoisie or corruption.
these of course are the realities of 'democratic socialism', of sweeping a socialist into office in a bourgeoise democracy. through some extremely clever political structures, such as the new constitution, communes, and bolicarian circles--he was able to move much more radically than most in his position. but ultimately, he could not escape the fundamental limits of the source and constraints of his power.
the second is that--and this is a very tawdry and obvious piece of analysis--while it is of course admirable and correct that he seized the nation's oil wealth and enriched the country with it--the way he did it was obviously shortsighted. without a sovereign wealth fund, worker's democratic control of the oil industry, or a solid and far-ranging investment plan, he laid the groundwork for some of the current crisis on the assumption that oil prices would stay high forever.
maduro inherited these faults and added far more of his own. during the crisis that began in earnest in 2016, the other shoe dropped wrt oil prices at the same time as the US tightened their murderous sanctions regime. faced with economic crisis, maduro has broadly chosen to move from chávez' strategy of accomodation with the national bourgeoisie to a full on alliance. social programs have been slashed, pensions cut, wages have plummeted, and worst of all, maduro has sold off countless state enterprises in the hope that oft-prayed to benevolent deity, "foreign capital" would miraculously heal the economy. in the course of this he made an enemy of many early chavistas, as well as the leftmost wing of chávez' coalition -- he has mobilized the full force of the bourgeois state against the country's communist party and other genuinely revolutionary movements, most gallingly the marxist-leninist movimiento tupamaro.
so, tldr: chavismo was genuinely radical compared to even your average third-world social democracy--however it remained fundamentally constrained in what it could accomplish by the lack of an actual proletarian state, was unable to rid itself of reliance on the national bourgeoisie for that same reason, and made some very avoidable mistakes in the handling of the nation's oil wealth--maduro inherited those flaws but has been much more accomodating to both national and international capitalists to the detriment of the people of venezuela.