In my case, I often find life goals and enjoy the journey when I'm mentally healthy, not vice versa.

I can't control my mood, but when I am positive, I start a new hobby like dancing or playing an instrument, cook healthy, lift, sleep well, study new things, etc. But when I'm depressed, I lose all interest in my life goals, eat junk food, skip exercise, and browse the Internet all night. I can't even enjoy my hobbies anymore.

It's always my mood that comes first, then I can find life goals and naturally do all healthy stuff.

Funnily, when I'm mentally healthy I also visit Hacker News frequently, but when I'm depressed all I do is infinite scrolling Reddit/TikTok.

That could definitely the case. I can't really tell which one comes first, mood or objective.