I am in my early thirties and have struggled with the feeling of life slipping through my fingers and not being able to make the changes I want in my life.
If I have learned anything in the past year it's this: Consistency pays off. Spend 10 minutes reading, do 10 pushups, get a run in (maybe 5min) every single day and you will look back and be amazed at your own improvement.
That being said, I rely heavily on my morning routine to set the tone for the day. - make my bed - go for a run - do a 3 min workout - shower and get dressed - coffee and breakfast - some reflection on how I'm feeling and the day ahead of me.
If you are isolated find groups for hobbies you enjoy or hobbies you're curious about. It's a good way to meet people with similar interests in setting that don't involved drinking.
If you want to start today: - get some movement going on. walk, run, cycle. - prepare some food for yourself. don't eat out period - cut out drinking
Mostly be deliberate about the things you include into your life. Challenge your habits and status quo. Once you automate the small things you need to care for yourself you can tackle the big things. It's a marathon, not a sprint. Put in some work everyday and it's pays off.