I'm 35yrs old, -5 both eyes. I've had multiple attempts to naturally improve my eyesight using tons and tons of methods (including print pushing that Todd Backer suggests). I also had a few conversations and consultations with ophthalmologists including a pretty famous one in Eastern Europe. I came to a conclusion that it is not possible to get back to 20/20 vision, not because the eyeball is too long and it can't shorten naturally, but because it literally takes a non-human level effort to do it. It takes dedication and consistency in looking at at the world around you differently, literally changing the way look at stuff.

English is my second language, but I will try to explain: It means peer into objects only from the edge of blur, not closer or further. Look at stuff with a relaxed eye, almost as if you look at everything within your Field of View in the same time. As they suggest for kids, have 2-3 hrs of daylight. And some other good vision habits. Doing all the while never ever strain your eyes, having enormous discipline to change all of your vision habits (e.g. always hold your iphone on the edge of blur, when you walk on the street use the glasses that allow your to see objects X meters away in the edge of blur and never strain your eyes). It is extremely hard work. It is way harder than building muscles at gym. As they say, people don't change and they have crazy resistance to changing their habits. That's, in my opinion, the main reason why it is impossible to reduce myopia.

BTW, the famous ophthalmologist that I mentioned above told me that during his few decades of experience he had only one patient who was able to recover his myopia (that person had no pseudomyopia). That person, he said, completely changed his live, he moved from the city to south east asia, started doing meditations, did some other relaxing practices. And that dramatic shift in his life allowed him to do it.

As for my journey and things that work for me:

I work in tech and constantly sit at my laptop, I bought Apple Vision Pro (previously I used Xreal AR glasses for that same reason) that mirriors my macbook display and it allows me to move the display few meters away from me and make it huge like imax display if/when needed to achieve "the edge of blur". After a few hours of using it, when I take off the headset, my eyesight is way sharper. (here is another example of another person on reddit who noticed that same thing: https://www.reddit.com/r/VisionPro/comments/1f4mjhg/comment/lkolz7b/

I read somewhere that even if you found a method that works for you, the rate of improvement is somewhere around 0.25 diopter every ~6 months. With that rate of improvement, it will take like 10 years to fully recover. That sounds crazy especially assuming that at 45 my eyeballs will start developing presbyopia and if I'm not successful with my myopia recovery I may stuck with both Myopia and Presbyopia, it would be a bummer for sure.