I take the bare minimum medication such that I don't get side affects and just about notice my cycling is over a reduced range.
I drink very little nowadays and as a rule stick to a particular niche beer style for a period and only drink beer I haven't already tried. Having managed several craft beer bars and worked with most local breweries it's rare a pub has something I don't know. I don't take drugs outside of prescriptions and haven't for a few years.
I have one coffee a day, first thing, and again stick to a particular origin for a long period so I don't find myself grabbing a starbucks for the sake of it. I go to bed at a sensible time and never let myself lie in.
I don't eat much sugar, or carbohydrates generally. I don't eat beef or lamb either. I try and include something like spinach or kale into every meal. I don't eat takeaway food very often any more, last year it was twice.
I try and get outside for an extended period each day. I sit down as little as possible. We have one television and it mainly stays off apart from the odd bit of kids TV or Formula 1.
When I don't feel like doing something I need to, I try and challenge that and prove to myself I can do it and that my fears were unfounded. If I'm worrying about something I ask myself what am I really afraid of and then I can reassure myself that if that situation occurred I could handle it.
I volunteer a day a week helping young people with mental health problems challenge themselves.
I keep extensive notes on ideas I have, things I need to do, etc, so that I'm not trying to remember things needlessly. My wife and I have strictly delegated tasks like monthly budgeting, meal planning. If I'm struggling with something I know to communicate that.
When I need to take a break mentally I'll put on an album I'm familiar with and play along with it or write down some recipe ideas or similar. My garage is where I can go to be alone when I need that.
Probably there's a hundred more things that aren't springing to mind right now