For me the issue solved itself when I started using my first columnar staggered ergo keyboard, meaning instead of having the key rows slightly misaligned for hi

For me the issue solved itself when I started using my first columnar staggered ergo keyboard, meaning instead of having the key rows slightly misaligned for historical reasons it has a different height for each column of keys to accomodate the different finger lengths. Doesn't sound like such a drastic change, but within minutes it will teach the user in what ways they've been typing incorrectly all along - and in what ways the standard keyboard layouts actually promote incorrect typing. It takes some time to get up to speed again, but nowadays I type using all fingers evenly ~95% of the time, simply because in contrast to the off-the-shelf design it makes correct typing far more comfortable while requiring quite some finger gymnastics to pull it off any other way. Of course due to the different design it's not quite as flexible, for example it's not great for gaming and mainly shines when the mouse is used sparingly. But as I mainly work with text it's been a great experience for me.