You could also do something more reasonable like avoiding processed carbs and sugar as much as possible. I'm not knocking keto since I've never done it but I found a common sense diet that is sustainable is the best diet. Kudos to those who can go keto for their entire lives. I certainly can't. But that doesn't mean I can't be healthy.
Ultimately being healthy isn't rocket science and doesn't require some esoteric diet. Don't eat shitty food. Move/exercise more. And lift heavy things if you want to get stronger.