Long time lurker, first time poster. I work for a company that produces and manages a lot of domestic and international business listing sites. We saw a couple steep drops in traffic around October of last year, and a few weeks ago we realized that it could very likely have been caused by a huge amount of toxic backlinks to our sites.

So for the past few weeks I've been using Semrush and Google Search Console to find and disavow the domains that are spamming toxic backlinks to our listing directory sites. I'm posting because I've been unable to find much documentation on dealing with this problem, and I was hoping anyone that has been dealing with toxic backlinks longer might have some insights or info that might help me get on top of this. I've already hit the 100,000 line/2mb limit for disavowal files for one of our sites and the spammy backlinks just keep coming. My boss has set up Majestic and Ahrefs plans, so I have access to those in addition to Semrush. I'm just asking for guidance or pointers on dealing with this. Thanks for reading my post :P