I'm sure Dr. Berry has some great, up-to-date info, but in case he's offline, here's my take (from reading up on the topic, and also listening to a lot of podcasts).

You want to listen to Dr. Thomas Seyfried, he's interviewed on a lot of podcasts. He's the main guy on metabolic therapy for cancer (i.e. ketogenic diets, zero carb).

Also I just recently heard an interview with a younger female doctor, who got disillusioned with mainstream medicine, and switched to being in an advisory role, specializing in metabolic/ketogenic therapy for cancer. Unfortunately I don't remember her name (I knew I should have written it down!) but I believe the interview with her was in the past couple months, and on a carnivore podcast. You might ask around on carnivore forums. Basically, searching online (and preferably NOT on mainstream sites) for metabolic therapy for cancer should get you lots of info and people to contact.

This book might help out: Cancer Care: The Role of Repurposed Drugs and Metabolic Interventions in Treating Cancer. It's published by the Independent Medical Alliance (formerly FLCCC.net), they had/have a lot of alternative ideas for treating covid.

You can download it for free, or buy it on Amazon. https://www.amazon.com/Cancer-Care-Repurposed-Metabolic-Interventions