has been losing a lot of votes since Sarah Wagenknecht went crazy.

Sorry, but Sarah did not go crazy. The new leadership of the party basically threw every pro-worker position over board and replaced it with liberal idpol bullshit in a cheap attempt to become the next Grüne/Bündnis 90. This predictably failed, because the orginal already exists and people at the existence minimum tend to be kind apathetic (at best) towards idpol. The massive loss of votes happened before Sarah said anything. She then correctly pointed outt he mistakes of the party leadership, which ignored her (at best, demonization was more common), which led to a continuation of the downwards trend.

I hope the party splits soon, those radlibs in the current Linke ruined it.

I think the DKP is the most based

I would call Die Linke neither Marxist nor attribute their fall to Wagenknecht. Die Linke is more or less just a melting pot of various vaguely “leftist” positions, but it is not clearly marxist. I have never seen them advocate or employing Marxist analysis. There are Marxsists in Die Linke, but from my personal experiences, most of them are pretty unhappy with the party.

As for Wagenknecht, isn’t she one of the most popular politicians according to polls at the moment? The downfall of Die Linke has been going on for quite some time now, and I don’t think it started with Wagenknecht, nor do I really think Wagenknecht is responsible for losing votes. Die Linke has had issues gathering Working Class votes for a long time now, and I think that comes mainly from their inability to provide the working class with a proper alternative vision for the future (Socialism) as well as their constant, open infighting.