A lot of it is people can't get the time off to go vote or local rules have made in person voting take so long, it's virtually impossible to stand in an 8+ hour line to even get in the door to vote.

We need a national vote by mail plan like we implemented in Oregon 23 years ago. It works, participation is higher than any non-vote by mail state.

https://www.opb.org/article/2023/01/05/oregon-voter-turnout-highest-in-us-general-election-2022/

”61.5% of all the eligible citizens in Oregon cast a ballot in our election,” he said, “and we edged out Maine by .05%”

Meanwhile...

https://www.pewresearch.org/short-reads/2023/03/10/turnout-in-2022-house-midterms-declined-from-2018-high-final-official-returns-show/

"Nationwide, nearly 107.7 million valid votes were cast in the 2022 House elections, representing about 45.1% of the estimated voting-eligible population, according to a Pew Research Center analysis of official returns from all 50 states. That was down from 48.1% turnout in 2018 – when midterm voting reached levels not seen in more than a century – but still higher than the 34.4% turnout rate for House elections in the 2014 midterms."

How did Oregon do in 2018 and 2014?

67.8% and 70.9% respectively.

Vote by mail works.