If you want to go back to being a vegan or want to try it for the first time, start by going meatless just 2 days a week, but pick specific days, like all Mondays and Thursdays. And after you’ve done that a while, expand to 4 days a week, etc.
There is no question that vegans live the longest — by far — and that a diet that includes meat, particularly one with heavy meat consumption, is much more correlated with both heart disease and cancer, which has been known now for decades, ever since the seminal China Study. If you want to live long and without the two biggest risks to your health (heart disease and cancer), then veganism is a no brainer…if you can manage to do it.