If you know when to quit, you are lucky. Or you have thought about it a long time, or you are weary of it not working out. Or an epiphany struck. One of the above.
However you tripped upon the decision, it is good.
It is good because even if it is the wrong path, at least you have chosen. The fog of weighing pros and cons can be as debilitating as the act of continuing down a dead-end path, so simply upending the process feels like a win.
I write about this in reflection upon my own big quit. After a seventeen-year career, I quit to move here, to the USA. What I did right was to look at it this way: I could have spent twenty more years doing the same thing (and being ever more resentful of bosses and the company in general), but chose not to. Living the same year twenty times is not a way to lead a life.
Another easy to say but not so easy to pull-off achievement was to leave at the top. No-one ever tells you to leave the party NOW. NOW is often only THEN in hindsight, in the haze of the morning after. And I left at both my top and that of the company (as it turns out years later.)
And probably the most difficult was that I decided to leave behind the security. Thinking that a job gives you anything more than an option on tenure is a mistake, but it never seems that way. Cultivating resilience, energy, flexibility, new skills, adaptability, willingness to try – these are the elements of mental skill that will keep us in decent shape until we die.
Oftentimes there is no choice but to build up to decisions to quit. Whether there is a shortcut will be up to us. But keeping on keeping on is a decision to to be taken lightly. If the spark is there for change, it might be worth indulging.