A number of candidates who prevailed in the last U.S. election can rightly be called populist in the 19th century "prairie populist" mold, opposing monopolies and concentrated power, championing the rights of the average citizen, and opposing tariffs which hurt farmers and consumers.
Perhaps the senator-elect from Texas, James Talarico, provided the clearest populist message by saying that the real divide in the United States is between the top and bottom of the income and wealth scale. That's a pure populist message.
The solution for a populist, of course, is to redistribute the wealth and power of society in ways that make the lives of average citizens better. That can be done by expanding and subsidizing such services as health care, transportation and education, making them more accessible and affordable. It can be done by increasing taxes on the wealthy, while leaving them unchanged or lowering them for those of middle and lower incomes.