Not gonna lie, looking at older songs and thinking about "missed opportunities" is really interesting. Looking back to songs made by us in 2021 I find a lot of them lol. But what I've noticed is that the older songs tend to have really good ideas but lacking in execution.
I think it's important to have a level of pride in your songs. I mean being proud but not egotistical. Adventures of a lost clown, for instance, is my magnum opus and it's an older song of mine.