Ask HN: Anyone got advice for someone like me nearing 40s?

I will be 40 in another 6 months time. It almost feels like more than 50% life is gone. While there are some wins, some notorious, it's mostly struggle and negativity in my life.

Recent events in last 2.5 years have got me wondering what's the point of doing anything when it all could be over in another 10 or 20 years or could be any moment.

I started a startup but that is not doing well. We are struggling a lot. We don't have any help. Nobody wants to buy even though we see competitors are killing it. We have 70% overlap between features and we are genuinely better for infra. processing. Still, we are struggling.

I have toddler daughter who have a specific diagnosis which appears to be a non-life threatening condition. It takes a lot of time to care for her.

On top of this I have looming divorce on my head. I married a woman I thought I was settling for life with. I was under assumption she would take care of things 50% as I would. Boy, I was wrong. It turned out she is BPD, narcissistic and extremely manipulative. Some days it's okay. Other days she screams at me louder than thunderstrom for trivial issues. Things must go her way or I get threatened for next two weeks.

Covid was shit and staying home and working from home sucked. I just never recovered from downward spiral.

Job market remains brutal. Although I have decade+ experience at companies I am not sure how it would turn out if I decide to go that route.

As I enter fourties, I am wondering how would I spend remainder of my life trying to add value for my toddler and honestly doing something for myself.