Will liberals and progressives holding Democrats to high standards while conservatives and MAGA holding Republicans to none cost us future elections?

I believe part of the problem we have with politics is that both sides operate on completely different standards. I see people on the left say they couldn't vote Democrat because they weren't progressive enough, didn't codify Roe vs Wade into law, and abandoned the working class. I don't believe those are standards that can ever be met in 4 years, and the standards are so high or arbitrary they can't be met. Meanwhile, no one holds Trump to any sort of standards, and we've accepted that that is normal. He's the most pro-peace candidate one day and then talking about sending the US military to the Middle East the next. Since he is not held to any standard, his supporters will back him either way. That leads to a world when Democrats can never win since they're the only ones held, and punished, to standards.

What do you believe the solution to this is? How do we get back on a track where people hold both sides to consistent and principled standards?