Yes, I have done it 10 years ago: I've left a job because of burnout without another opportunity. After that, I've panicked for 6 months without a job. Never again: I promised myself to never leave a job if I was without energy.
yes, english is not my first language, so I use AI to helping me structure the article, but I've edited and fully reviewed and take responsibility for every word in it. (Anyway I will trust less AI next time, so thank you)
What I was trying to say is that if you do less because you don't like where you work, you are losing opportunity to learn skills, or worst: you are learning to do less in general. How can you find a new and better job if you are doing less?
First, you can do your job but not be overzealous.
Second, it is not because you are not "doing more" for your employer that you miss opportunities to learn skills. You can do that for yourself on your personal time to your own benefit.
In addition, with what you wrote, it didn't look that like that you were suggesting to learn skills: You said to document what you already know, "transfer" your knowledge, so that it is easier for others in the company to live without you (or get ride of you).
About other people get promoted by the work you do quietly, I think there are three factors that makes a work not noticeable:
1. the quality of the work
2. the presentation of the work (show your work to people that maters)
3. the direct manager unfairness
The first two are in your control, if you think you have done all you can do. I think you should act to change the situation: talking to HR about the situation and/or search for another company
Yes, I have done it 10 years ago: I've left a job because of burnout without another opportunity. After that, I've panicked for 6 months without a job. Never again: I promised myself to never leave a job if I was without energy.