Same here.
I went 11B straight out of high school.
We trained a lot and I got a good foundation but what you find from training is that it fades.
You constantly need to retrain to keep your skillset.
Training sets the coursework. It's up to you to do the homework. I'm not a shining example of perfection, but I know shooters that are. They put in the work multiple days a week and constantly attend training. They never become complacent.
There are members of this forum that think shooting the same six plates of a plate rack slow fire with random pistols is adequate for them to take on a slew of bad guys. Those are the people that need to be filling basic pistol classes every weekend.