Finish a big project at work before the deadline? "Is this meaning?" Obviously no. The big project won't impact the mega-conglomerate's bottom line. And if it did, what's it mean to increase the revenue of your employer by 0.001% YoY? For you, personally, that is. Etc.
Just got married? "Is this meaning?" Again, no. Anyone can get married. Most people do get married. It's incredibly common. You're not special for getting married, yet people spend lavishly on weddings to force some amount of "meaning" on the occasion. The day before your wedding isn't different than the day after. I've been to a dozen weddings and can really only recall the details of maybe two of those.
I've not seen a more miserable group of people than /r/fatFIRE on reddit. They have insane wealth, go to retire, and find their life hollow. The mistake is thinking there is some reward is at the end of the journey. I have $30 million dollars, I've retired, now what? You either fill that hole with giant amounts of crap (new Lambo, fancy house, huge TV) or "experiences" (which really translates into traveling to places where poor people are your temporary servants because of the gross power imbalance wealth has granted you). Or, more work. The real secret to retirement is... maybe don't?
Hayao Miyazaki is still working, and certainly doesn't need to. He also doesn't believe that personal happiness should be a goal (it's a very Western point-of-view), and considers filmmaking to be suffering[1]. And I suppose that's the real reward for having kids. The meaning is the work and the pain. You'll change a child's diaper thousands of times. But you'll also get to see them smile and laugh.