Unfortunately, it’s not possible to express this sentiment via election participation. Abstention ends up supporting one candidate more than the other. What seems to be an affirmation of neutrality is not that in practice.
This is why it was a major issue for me that the Democrats did not hold a primary and just decided Kamala would be the candidate. If a major part of your campaign is "vote for us or democracy dies!" it's pretty hard to swallow if you increasingly feel that your voice doesn't matter in your own party.
It was just a glance on one of the shows during the returns last night, I maybe be completely wrong.
Not just election participation, no.
You do have to use the generally-free-to-use, generally-globally-accessible publishing systems that are available to nearly anyone with a computer to explain why you refused to vote. (This is my big issue with the "Refusing to vote is meaningless, because noone will know why you didn't vote." counterargument.)
Whether your assertions that you didn't vote because -for instance- none of the available candidates were people you wished to see in the positions they were running for get deleted because they are "Election misinformation" or similar is an open question.