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Different things work for different people, and there's a LOT of anecdotal evidence on the internet about that "one routine/diet/..." that will fix your health in a month. That's not how it works and it's potentially dangerous.

If you have serious health issues, you need to see a professional. If you just want to improve your overall well-being, focus on diet, sleep and exercise and be consistent about it.

There's many books written by very smart people who have a professional background and who can back up their advice with studies/papers/etc.

Personally, I try to watch my diet, work out 2-3 times a week doing strength and cardio training and try to be in and out of bed at the same time every day.