Most Venezuelan refugees cite crime, access to food and healthcare as reasons for leaving. Guess what US sanctions were causing. If you guessed lack of food and supplies for healthcare which caused an increase in crime, you'd be correct.
If socialism doesn't work, why do they spend so many resources making sure it fails?
From your source: 'Beginning in January 2019, during the Venezuelan presidential crisis, the U.S. applied additional economic sanctions to individuals or companies in the petroleum, gold, mining, and banking industries'
If you check the GDP per capita of Venezuela it was increasing at positive rate immediately after Chavez took power.
Life expectancy was also increasing after Chavez had taken over. https://data.who.int/countries/862