My dad once told me a sentence that stuck with me ever since:

Somehow everything always continues to be.

In German though, he said "irgendwie geht es immer weiter".

Meaning that even if your rent is due and you can't pay, you're not on the streets tomorrow. And if you land on the streets, you still find shelter and have a wife which can console you. And if you don't find shelter, you still continue to live. You will always live.

There is always a tomorrow and somehow you'll manage to reach it, unless you die at some point. That point is usually way, way farther out than you could imagine.

The stuff I lived through sometimes looked like I wouldn't survive, but I did. Homeless people survive every day.

Regarding happiness, it's hard for people who experienced long times of it to finally realise that they were lucky and there's just periods of happiness to be found. Sometimes those periods are just moments. Cherish them. The small things. Fresh air, sun, a cuddle, some discount allowing you to get something nice for your wife.

What else could I do to save money?

Engage less in your job and use the free time to search for better opportunities. Capitalism keeps its low wage workers occupied so they don't unionize or search for better jobs, it keeps them poor so they can be exploited with high interest loans. If you can find a way around that, exploit the people which are higher up than you. Always steal from the rich, because that's repossession.