It seems like I've tried everything, from Atomic Habits to Tiny habits, to GTD, but no system has worked for me. I can't seem to get myself to change my habits.How do I at least get myself to change one habit? What is the true path to gradual change?

eat magic mushrooms and go walk in the forest
you'll come back a new man

>>33399964 (OP)
Helps if you move out of your usual environment. Like even move to a new town and get a new job. And while you change that, you also change all the habits.

>>33399964 (OP)
Replace them with new, incompatible (or at least competing) habits. For example, when my dad got out of the army he had a smoking habit, which he overcame by chewing gum, and that habit in turn faded away in time so that when I came along he simply has the occasional life saver (candy).