Actually, the recent record turnouts should really be getting you to pay attention to how the elections are structured. It turns out, the way districts and the electoral college are organized means that where you get out the vote matters. Telling people to vote harder doesn't make those systemic obstacles go away.
This is on purpose, too. The farthest-right states also just so happen to have the lowest educations, incomes, healthcare, etc. They make it miserable for people who live there to organize AND so people from cities don't want to move there.
The thing is, the record turnouts are still pretty bad. Something like 60% of eligible voters, I think? You're right that there are systemic reasons why it's not feasible for some people to vote. But if everyone who didn't have a systemic reason to not vote did, the turnout would still be much higher.
Overall, 70% of U.S. adult citizens who were eligible to participate in all three elections between 2018 and 2022 voted in at least one of them, with about half that share (37%) voting in all three.
I'm not sure how intense your off year elections are, but one of mine had only a single uncontested race, so I'm not sure I'd jump to considering missing some of the offyears "abysmal".
Based on the numbers I'm looking at, the people who didn't vote were the ones that were likely Republican voters. The people that stayed home were likely Republicans who did not vote for Trump. I'm all for political engagement, but I'm not sure how invested I am in making sure Trump gets all the votes he told people not to cast.
Democrats say "vote!" -> not enough people actually vote
If it's known that voting isn't effective for whatever reason (including turnout) then suggesting it in the first place is a marker that one is unserious about realistic solutions and should be ignored.
I promise you that the Republican Party would undergo serious reform even if they were kept out of the presidency for 3 terms. I'd bet on a complete collapse if they find themselves a significant minority in Congress for only a couple terms. We're not talking about a crazy unrealistic amount of time here.