Johan, thank you for your support. I slept on it. I’ve come to the conclusion that I’ll keep doing jiu-jitsu with a more relaxed approach. I want to invest my energy and time into activities where I have more to contribute. In jiu-jitsu, I have less than 15 years of experience, but in karate, it’s over 50 years. In karate, people are also clearly interested in the development plans I present, so perhaps I can actually help move the sport forward. In jiu-jitsu, the most I can do is show a slightly different way of training—and even that approach, gamification, is already becoming common practice at many gyms.

Hey Hannu,
There is absolutely nothing wrong to keep doing Jiu Jitsu with a more relaxed approach like you do in my opinion, especially as a hobbyist.

I am in a similar position, although I am only almost 50 years old and not in your age.
As long as you enjoy training and teaching.

I am just an average Brownbelt hobbyist without being affiliated anymore, but I have the luck to train with and learn from friends „globetrotters style“, who are long time black belts.
Getting to black belt isn’t my priority but to be able to stay on the mats enjoying the art/sport as long as possible. If that would mean I would have to stay Brownbelt, than that’s what it is.
I do what I can, when I can under the given circumstances with family commitments, working shifts on weekends, you name it…
But I like Chris Haueter‘s quote :

"It's not who's good, it's who's left. It's hours on the mat. If you put in that time, natural athlete or not, you'll be a black belt. You're going to be somewhere in ten years (or 15 or 20😂) why not be a black belt? You just can't quit." - Chris Haueter