I mean honestly it’s not all that low. Could it be better? Absolutely. But I wouldn’t categorize it as “low.” — I will say that voting is our civic duty and must be cherished at all times. If you ask me— we should automatically register voters in the US upon their 18th birthday. I think this would undoubtedly raise voter turnout and that’s always a good thing. Generally, I wouldn’t say our turnout is low, or so low that it is problematic though!
After increasing for many decades, there has been a trend of decreasing voter turnout in most established democracies since the 1980s. In general, low turnout is attributed to disillusionment, indifference, or a sense of futility (the perception that one's vote won't make any difference).