Two things that really improved my life long term
When people say "just drink more water" or "sleep 8hours" it's simply not easy. It wasn't for me for a long time but I faced severe consequences because of that and I still suffer from the lack of those things that I did at 17.
And because of that I kind of forced myself to have this habit of drinking enough water and sleeping more.
I went to therapy to fix the sleeping issue btw so I'm not gonna say "just do it" because I know how difficult it is.
But that aside it truly improved my life. I have been sleeping well for 6 years. I sleep adequately. I wake up feeling fresh and energized. I feel my head empty and ready to take challenges that day. I genuinely feel like I can retain memories.
And drinking water also makes me energized.
I have been so consistent with my routine that I didn't notice how horrible life is when you're dehydrated and not sleeping enough. A few weeks ago I had some work that was quite intense so I was very busy. I didn't drink much water and I hadn't slept more than 4 hours. That's when I felt it.
My body was aching. It was like being dried up from inside. Thoughts were cloudy. I was tired. Hungry even though I just ate. Cranky. Moody.
Maybe not as dramatic as I am typing it but I visibly felt how different it was from my usual days.
So yeah I definitely think you should drink a lot of water and sleep enough but YMMV.