>i.e. wondering what the point of my life is despite it being “good” by most measures
Stephen Pinker uses an example that considering we have some evolutionary development followed by acquisition of rational ability that we tend to rationalize things we acquired through evolution. He uses an example of peacock but I use a different example.
For instance, cats have an evolutionary behavior which makes them cover their leftover food, to hide their tracks from prey (called 'caching'). If you have a cat living in your apartment, then you will see them try to cover their food with imaginary dirt [1].
If Cats developed rational ability, and you asked them why they were doing it on a hardwood floor, they might say "I do it because I give my food back to earth, this helps me procure my next meal", or "I do it because I am thanking the cat gods for giving me that food", or even "because I am cleaning my paws after eating by rubbing them on the ground right next to the bowl" or something other funny like that.
Same thing goes here. Evolutionarily speaking, we evolved to chase food and satiate the hunger. What happens if we are constantly 'full', well evolution doesn't really know much about that. There has been no natural conditions under which a creature is full all the time, however there are situations when a creature is hungry all the time.
If you are going to create a situation in which you're 'full' all the time (as you described 'good by most measures'), then you're pushing your mind in an uncomfortable situation where it doesn't know what to do. It's like if earthquake survivor sniffing dogs don't catch survivors for some time then they get depressed, so their handler has to make them sniff out fake survivors to make them feel better.
In a nutshell, you've eliminated your hunger, and now your mind doesn't know what to do. Reintroduce hunger. Not necessarily literally, but it would be the easiest, most practical way of doing it. I've been facing a similar problem for past few years, and my solution was to leave the comforts of the first world as an immediate measure and it made a big difference.
1. https://youtu.be/vxpe3V0pspM