Election day should not be made into a national holiday. The countries that have made election day into a holiday have either not seen significant increases in voter turnout or they have only because they have employed other strategies as well.
For instance, Singapore seeing a voter turnout of 93.6% for the 2015 election of their Prime Minister was not only because they have an election day holiday; the holiday is not even the primary reason.
Singapore had such a high voter turnout because they have a mandatory voting law. If citizens choose not to vote, those citizens must pay a fine.
Mandatory voting laws are the types of strategies that the US should employ to increase voter turnout. An election day holiday is not the solution America needs to solve its voting problems.