Choose your targets. Don't throw accusations around wildly, especially when they don't even concern the person you are talking/writing to. Isolate the tiny number of actual anti-semites from those who are just being dumb, so that the bigots
can be isolated.
Bother with your MP. Why would any other MP be arsed with someone random writing to them with ranting complaints and demands for action if they aren't either a party member or their constituent? Who gives a fuck what some twitter login (who may or not be real or russian, or jewish, who can tell?) Unless there is an actual connection.
As
cantsin has pointed out, there are over a thousand cases being dealt with by a tiny team. Many of those facing charges have lawyered up, and so the cases proceed at a very slow pace, which is incredibly frustrating for everyone, accused, accusers and the party as a whole. But that was always part of the point for those who are plotting. Labour could spend all its cash and staff piling through those cases, but that would not only divert resources away from more important issues, it would also leave a door open to legal challenges and even more time and money wasted.
A large number of the complaints - most, imo - are either complete bollocks (like the woman accused for replacing the DWP logo with Arbeit Mach Frei) or about minor cases of daftness (like someone posting a Rothschild banker meme once). Those have no need to be referred and should be dealt with at a purely local level. For those who like to post such bollocks more regularly, they should be given training and education (not by those cunts at JLM though) into what is and isn't acceptable. Repeated behaviour thereafter should lead to suspension/expulsion.