I don't understand this.
Voting is easy and a basic civic duty we are taught about in middle school, in pretty much every state, you have weeks to do it, can drop off in mail boxes, ballot boxes, in person, early, etc.
Presidential elections only happen every four years, and there are going to be very very few people who would not be aware that it's happening well in advance.
Not voting is just plain lazy, that's all. It's a responsibility that takes very little effort to do, there are multiple avenues provided to do it and you only have to do it two or three times a decade.
No one is forcing me to take a shower every morning or brush my teeth, or go to work everyday, but I do it because it's important, and my overall health and life is affected by it.
How come rural, under educated voters are able to make it out every election without problems.
I'm not going to defend people failing to do a simple task once every four years.
You have four years to prepare for the event. And there are only two states that don't offer early voting, and those states allow absentee ballots for people who won't be home, have disabilities, or would otherwise struggle to vote in person. We have more resources available than ever, it's easier than ever to vote, generally, thanks to widespread mail in voting adoption (which was demonstrated by a 6% higher turnout in 2020)
I am sure you can find excuses for people here and there who were really truly unable, but 90 million eligible voters failed to do their civic duty. Even assuming every single homeless person was unable to vote, which is unlikely, that's still 88.5 million that didn't show up, and let's take EVERY single person with a disability and assume they somehow couldn't vote, that's still 45 million people that didn't show up. And let's take EVERY single person under the poverty and assume they were unable to vote, then let's assume there is absolutely zero overlap, you still have 10+ million people who didn't show up, and that's assuming not a single of the above people voted.
Failing to prepare for something doesn't excuse you from the failure of doing it.