If you went the keto route, you may want to explore BACH1 inhibition. Study [3] acknowledges the effective role of keto in reducing or controlling tumor size, but with an associated increase in BACH1 expression appearing to account for the increased metastasis (in mice).

Apparently there are a couple small molecule inhibitors that inhibit BACH1 (see ChatGPT). Unfortunately, they seem to be still in the experimental or early clinical stages.