"bOtH sIdEs" is only true for establishment Dems, and if you pay attention, progressives are gaining in power and prominence. DSA is not the only source, but it's becoming a lightning rod.
Show me ANY good Republicans. I'll wait.
The only hope for us is to support the actual progressives instead of lumping them in with the establishmen Democrats, because doing the latter is EXACTLY what the fascists want.
So it's like you're mostly right but critically wrong when you write off both parties. And yes, voting is critical, but what is even MOR critical is supporting progressive candidates before the primaries and into the primaries and THEN in the general. Always vote, and when you vote, always take the better - or less shitty - option. That's where "vote blue no longer who" comes into play - in the general election, an establishment Dem is still less shitty than a fascist Republican.